| 单词 | iridium |
| 例句 | The amount of iridium in the Alvarez sample was more than three hundred times normal levels–far beyond anything they might have predicted. A Short History of Nearly Everything 2003-05-06T00:00:00Z He insisted that the iridium had been deposited by volcanic action even while conceding in a newspaper interview that he had no actual evidence of it. A Short History of Nearly Everything 2003-05-06T00:00:00Z Tests on other samples–from Denmark, Spain, France, New Zealand, Antarctica–showed that the iridium deposit was worldwide and greatly elevated everywhere, sometimes by as much as five hundred times normal levels. A Short History of Nearly Everything 2003-05-06T00:00:00Z I put a few knickknacks on the table to keep the plastic out of the iridium bowl. The Martian 2011-01-01T00:00:00Z This involved months of difficult chemistry to distinguish the various radioactivities from bombarded foils of platinum, iridium, and gold. Big Science 2015-07-07T00:00:00Z I let one drop fall into the iridium bowl. The Martian 2011-01-01T00:00:00Z The secret behind the team's new ecO2 device is sputtered iridium oxide, a successful electrocatalyst that has also been used in biomedical applications. A breath of fresh air keeps drug-producing cells alive longer 2023-11-09T05:00:00Z Conversely, ruthenium displays commendable activity and is a more cost-effective option compared to iridium, although it lacks the same level of stability. New approach to water electrolysis for green hydrogen 2023-11-03T04:00:00Z Until now, similar catalysts have used expensive metals like platinum, rhodium, or iridium. A potentially cheaper and 'cooler' way for hydrogen transport 2023-10-26T04:00:00Z Another is that iridium, which the catalyst is based on, is a precious metal. New catalyst could provide liquid hydrogen fuel of the future 2023-10-12T04:00:00Z It’s also possible that trace amounts of gold, silver, platinum or iridium — iron-loving elements — could be dissolved in the asteroid’s iron and nickel, she said. NASA spacecraft launched to mysterious and rare metal asteroid in first mission of its kind 2023-10-13T04:00:00Z They based this on evidence found at various sites around the world, which suggested that a thin layer of iridium, a chemical element rare in Earth’s crust, had an extraterrestrial origin. We're all gonna die! How the idea of human extinction has reshaped our world 2023-10-08T04:00:00Z Initially, the research team developed catalysts using both iridium and ruthenium. New approach to water electrolysis for green hydrogen 2023-11-03T04:00:00Z Dunn and Currano spent a month in the field looking for rocks bearing the telltale stripe of iridium deposits the asteroid strike left on Earth. The biggest extinction event in the planet’s history is happening again — in Santa Cruz 2023-05-31T04:00:00Z In Figure 2, the iridium layer is the light band. Fundamentals of Biology 2015-01-01T00:00:00Z “That’s the K-Pg boundary” — the visible line of iridium deposits left by the asteroid strike that wiped out the dinosaurs and roughly 75% of other living things on Earth at that time. 'A story of extinction.' La Brea Tar Pits recognized as a geological heritage site 2022-10-28T04:00:00Z Buried in the dirt across the globe is a thin layer of dust sprinkled with iridium, a silvery-white metal abundantly found in asteroids. NASA pulls a "Deep Impact" as its spacecraft collides with an asteroid 2022-09-27T04:00:00Z These catalysts retained the advantageous properties of iridium and ruthenium. New approach to water electrolysis for green hydrogen 2023-11-03T04:00:00Z Because the eyes are so important in communication the condition called heterochromia iridium is very noticeable. Biology for AP Courses 2022-06-09T00:00:00Z These researchers hypothesized that this iridium spike was caused by an asteroid impact that resulted in the K–Pg mass extinction. Fundamentals of Biology 2015-01-01T00:00:00Z First identified in 1979, this sediment layer is rich in the rare metal iridium and other elements that are relatively abundant in asteroids and comets, but exceedingly rare in Earth’s crust. Astronomy 2016-10-13T00:00:00Z It also produces cobalt, rhodium, silver, gold, iridium, ruthenium, selenium, tellurium and sulphur. Don't take Russia back to 1917, Russia's metals king warns 2022-03-11T05:00:00Z The results showed a moderate increase in activity, but the dissolution of osmium had a detrimental effect, significantly compromising the structural integrity of iridium and ruthenium. New approach to water electrolysis for green hydrogen 2023-11-03T04:00:00Z Instead, they found iridium, an element that is rare on Earth’s surface but abundant in asteroids. Exploding stars may have assaulted ancient Earth 2021-07-15T04:00:00Z Two geoscientists advanced the theory in 2013, partially because the levels of iridium and osmium around the impact site were lower than should appear in an asteroid and more apt for a comet impact. Why some scientists think a comet, not an asteroid, caused the dinosaurs to go extinct 2021-02-17T05:00:00Z The reactions require a light-activated iridium catalyst and a cobalt catalyst. Reactions for making widely used aniline compounds break norms of synthesis 2020-08-04T04:00:00Z Most importantly, each pellet of plutonium is encased in iridium, which would contain the radioactive material if it fell back to Earth. Why NASA’s Perseverance Mars Rover Uses Nuclear Energy 2020-07-29T04:00:00Z They also require catalysts made from platinum and iridium. Next generation water splitter could help renewables power the globe 2020-03-10T04:00:00Z It is a shiny white metal in the same group as platinum, along with ruthenium, rhodium, osmium, and iridium. More precious than gold: Why palladium is soaring 2020-01-19T05:00:00Z Iridium-192 is a radioactive isotope of the chemical element iridium, according to the U.S. Kosovo’s prime minister resigns after being summoned to The Hague 2019-07-19T04:00:00Z Moreover, iridium is one of the rarest elements in Earth’s crust, limiting supplies of the catalyst and increasing its cost. Reactions for making widely used aniline compounds break norms of synthesis 2020-08-04T04:00:00Z Until the redefinition, all masses were calibrated against a lump of platinum and iridium kept in France. CRISPR-baby rules, fake-news law and kilogram retires 2019-05-21T04:00:00Z For example, the global production of iridium is only 7 tons. Next generation water splitter could help renewables power the globe 2020-03-10T04:00:00Z Until World Metrology Day on 20 May, every mass in the world was calibrated against a lump of platinum and iridium that resides in a vault near Paris. Physical kilogram is officially dead 2019-05-19T04:00:00Z From gold, platinum, and iridium, to thorium, uranium, and short-lived elements like plutonium. Gravitational Waves, Nuclear Fire, Rocks and Love 2019-05-05T04:00:00Z The fascination stretches back four decades, to when US father-and-son team Luis and Walter Alvarez identified iridium, a rare element found in asteroids, in sediments dating to the time of the extinction. Why we can’t get over the death of the dinosaurs 2019-04-09T04:00:00Z The boundary was full of the element iridium, which is rare in Earth’s crust but not in asteroids. Fossils show worldwide catastrophe on the day the dinosaurs died 2019-03-29T04:00:00Z No longer is the kilogram defined as the mass of a 129-year-old platinum–iridium cylinder in a vault in Paris. Daily briefing: Exoplanet spotted orbiting Barnard’s star 2018-11-15T05:00:00Z Two platinum and iridium prototypes — a meter-length bar and a kilogram-mass cylinder — were forged to serve as the standard units for the whole world. A massive change: Nations will vote to redefine the kilogram 2018-11-15T05:00:00Z Those sediments seemed to contain geochemical traces of an extraterrestrial impact, such as a peak in iridium, the exotic element that helped cement the case for a Chicxulub impact. Massive crater under Greenland’s ice points to climate-altering impact in the time of humans 2018-11-14T05:00:00Z The official object that defines the mass of a kilogram is a tiny, 139-year-old cylinder of platinum and iridium that resides in a triple-locked vault near Paris. Redefining the Kilogram 2018-10-29T04:00:00Z Most iron meteorites are generally comprised of anywhere between 90 and 95 percent iron, with the rest made up nickel, iridium, gallium and occasionally gold. Man uses meteorite as doorstop, finds out it's worth $100G 2018-10-05T04:00:00Z The researchers optimized various parameters of their reactions, including the concentrations of the iridium catalyst, the enzyme and the enzyme’s cofactor. Enzymes team up with light-activated catalysts 2018-08-14T04:00:00Z For the famous boundary 66 million years ago that marks the switch in period from the Cretaceous to Tertiary, this "golden spike" is represented by traces in sediments of the element iridium. Welcome to the Meghalayan Age 2018-07-17T04:00:00Z Phones typically contain as many as 60 elements, including rare metals such as iridium, which is used in touch screen technology. Mining for precious metals without a pick-axe in sight 2018-07-05T04:00:00Z The Alvarez team discovered the element iridium, at levels found only in asteroids, in Italian clay that dated to the ancient divide. Dinosaurs would have survived if asteroid hit Earth elsewhere, scientists claim 2017-11-09T05:00:00Z There is reason to believe that some asteroids are rich in valuable metals, such as platinum and iridium. A new way of propelling spacecraft may open up the asteroid belt 2017-09-21T04:00:00Z The last bits to go would probably have been the iridium and graphite casings that contain the probe’s 72 plutonium fuel pellets. Nasa's Cassini spacecraft falls silent after dramatic plunge towards Saturn 2017-09-15T04:00:00Z The last elements to succumb will probably be the iridium casings on the spacecraft's plutonium battery. Saturn probe heads towards destruction 2017-09-14T04:00:00Z Mined mainly in China, iridium has been in short supply, with the price rising steadily for months. Mining for precious metals without a pick-axe in sight 2018-07-05T04:00:00Z Ni says the company is looking for cheaper options to replace iridium, a rare and expensive metal. Two new ways to turn ‘garbage’ carbon dioxide into fuel 2017-09-01T04:00:00Z Inside, he finds his target: a small platinum and iridium cylinder weighing exactly one kilogram. Scientists are about to change what a kilogram is. That’s massive. 2017-07-05T04:00:00Z The ‘big k’ is a platinum–iridium cylinder stored in an underground vault in France. Sphere Made To Redefine Kilogram Has Purest Silicon Ever Created 2017-06-22T04:00:00Z But because ruthenium and iridium are scarce, expensive elements, it is desirable to find photosensitizers based on cheaper and more-abundant metals such as iron. Inorganic chemistry: Making iron glow : Nature : Nature Research 2017-03-28T04:00:00Z However, some e-waste mining projects, such as the RecEOL initiative recently announced in Ireland, can recover iridium from scrap products, along with other rare metals such as tantalum. Mining for precious metals without a pick-axe in sight 2018-07-05T04:00:00Z “I am made from plastic and silicon, copper and aluminium, platinum and iridium,” Pete replied. Sofer Pete : Nature : Nature Research 2017-03-28T04:00:00Z Then there are the toxic metals expelled by the impactor — things like nickel and iridium that make the ocean a distinctly unpleasant place to be. Right after an asteroid killed the dinosaurs, life returned to the scene of the crime 2016-12-13T05:00:00Z Four labs are currently testing for the presence of iridium. Team hunts tracer of 'dinosaur killer' asteroid - BBC News 2016-12-13T05:00:00Z The dinosaur-killing impact 66 million years ago - almost certainly caused by an asteroid - left a pronounced layer of the element iridium in rocks far from the crater site. Comet impact 'linked' to rise of mammals - BBC News 2016-10-13T04:00:00Z A telltale of this meteoritic material will likely be high levels of the element iridium. Chicxulub 'dinosaur crater' investigation begins in earnest - BBC News 2016-10-11T04:00:00Z Unfortunately, many of the successes so far have come through the use of scarce and expensive metals such as palladium, platinum, ruthenium and iridium. The new breed of cutting-edge catalysts 2016-09-05T04:00:00Z To determine if soot was indeed the proximate killer, Kuhio and his colleagues first collected samples in Haiti and Spain from a geological stratum known as the iridium layer. How Fossil Fuels (Really) May Have Killed the Dinosaurs 2016-07-14T04:00:00Z "Nickel behaves chemically in a way that is very similar to iridium; it loves to make strong chemical bonds with iron, just like iridium," he told BBC News. Team hunts tracer of 'dinosaur killer' asteroid - BBC News 2016-12-13T05:00:00Z The rock layer marking the end of the Cretaceous period was rich in iridium, a metal that is rare in Earth’s crust but more common in meteorites and asteroids. What Killed the Dinosaurs? Science Has Had Some Wild Ideas A bright yellow container with radioactive iridium-192 inside was in the truck when it was stolen early Saturday morning, according to a statement from the National Coordination of Civil Protection, a Mexican government agency. Truck Transporting Radioactive Material Stolen in Mexico 2016-02-29T05:00:00Z Although this runs contrary to the goal of replacing precious metals with Earth-abundant ones, says Hartwig, iridium can work with strong bonds such as those between carbon and hydrogen, which iron cannot. The new breed of cutting-edge catalysts 2016-09-05T04:00:00Z All over the world, the bones of the last dinosaurs are almost always found well below the extinction layer, which is marked by radioactive iridium, an element concentrated in asteroids and comets. Behind a Shopping Center in New Jersey, Signs of a Mass Extinction 2016-01-04T05:00:00Z To have real confidence, the scientists would prefer to see the element iridium. Team hunts tracer of 'dinosaur killer' asteroid - BBC News 2016-12-13T05:00:00Z At this point, many smart-alec children will say, “Don’t you mean iridium?” It’s elementary! Highlights from the all-new periodic table 2016-01-04T05:00:00Z Certain minerals such as gold, platinum, silver, tungsten, iridium, osmium, palladium, rhenium, rhodium and ruthenium might be mined and transported to Earth for on-planet use. The Dawn of the Space Mining Age 2015-11-24T05:00:00Z These new drugs contain iridium, a transition metal that doesn't break down easily. New Antibiotics May One Day Beat Superbugs 2015-09-18T04:00:00Z The International Prototype of the Kilogram, a gleaming object of platinum and iridium otherwise known as Le Grand K or Big K, is the last of its kind. Elusive Quest for One True Kilogram Finally Pays Off 2015-07-16T04:00:00Z "So we treat nickel as what we call a proxy for an elevated concentration of iridium. If we see high nickel, it's very likely that we're going to have high iridium." Team hunts tracer of 'dinosaur killer' asteroid - BBC News 2016-12-13T05:00:00Z In my lifetime, we discovered the telltale worldwide layer of iridium metal and the world ending meteoric impact crater near Chixalub, Mexico. Bill Nye to Grads: Change the World 2015-05-18T04:00:00Z But then came the stunning discovery by Luis and Walter Alvarez, father and son scientists, who while studying a clay layer marking the K/T boundary in Italy found striking amounts of iridium. Did a massive volcanic eruption in India kill off the dinosaurs? 2014-12-11T05:00:00Z Because the Earth pulls siderophile, or iron-loving, elements such as iridium or gold inward to its core, the planet's crust contains relatively low concentrations of these molecules. Comet Strike to Blame for Canada's Iconic Sudbury Basin 2014-11-19T05:00:00Z The great scientists and inventors who developed the first light bulbs tried out filaments of platinum, iridium, carbonised sewing thread and even bamboo - the latter both innovations of Thomas Edison's. The perfect metal for bullets and missiles 2014-07-11T04:00:00Z The radioactive load - iridium 192 - was normally used in industrial radiography, Mexico's interior ministry said in a statement. Thieves in Mexico steal truck with dangerous radioactive load 2014-07-04T04:00:00Z And the best catalyst for the oxygen-producing electrode, iridium, is both rare and expensive, which makes it unsuitable for commercial-scale devices. Solar energy: Springtime for the artificial leaf 2014-06-03T04:00:00Z That iridium, the Alvarezes concluded, came from an object from space that collided with the planet. Did a massive volcanic eruption in India kill off the dinosaurs? 2014-12-11T05:00:00Z There’s no actual iridium, the metal, used in Iridium, the GPS system. The Lancet's Manifesto For Planetary Health: Loons On The Loose 2014-05-28T04:00:00Z Of the 118 elements we are now down to just eight contenders: platinum, palladium, rhodium, iridium, osmium and ruthenium, along with the old familiars, gold and silver. Why do we value gold? 2013-12-08T00:26:28Z “In the local universe,” said McWilliam, “platinum is thought to be about 7 times more abundant than gold and twice as abundant as iridium.” Scanning For Galactic Gold 2013-10-30T10:44:00Z Scientists examining rock samples from the moon's mantle found much less iridium and gold than they did in samples from the surface of the moon or from the earth's crust and mantle. Does gold come from outer space? 2013-09-19T01:26:09Z Previous attempts to electrolyze ores used anodes made of expensive elements like platinum and iridium, or the components broke down in the 1,600-degree-Celsius temperatures needed to maintain a liquid metal-oxide electrolyte. Cleaner, Cheaper Way to Make Steel Uses Electricity 2013-05-09T15:45:03.593Z The other, crystalline iridium, was reported as a possibility only in January this year. Sticky problem snares wonder material 2013-03-13T18:20:26.953Z It is a chemical one which will stand-out to any far future geochemists as strikingly as the so-called iridium spike which today's Earth scientists use to demarcate the end of the age of dinosaurs. Leaving our mark: Fossils of the future 2012-11-03T00:34:29Z As an undergraduate chemistry major, Dr. Chirik worked on reactions that used iridium as a catalyst. Modern-Day Alchemy Has Iron Working Like Platinum 2012-10-15T20:02:01Z The researchers went digging in New Jersey looking for more fern spores, iridium traces and other potential clues that might help resolve all these questions regarding the end-Triassic mass extinction. Did the Reign of Dinosaurs Begin, as Well as End, with a Meteorite Strike? 2012-09-17T16:15:00.223Z The scientists proposed that the iridium was fallout from an asteroid that struck earth at the end of the Cretaceous period, 65 million years ago. Remarkable Creatures: ‘Nature’s Masons’ Do Double Duty as Earth’s Storytellers 2012-06-25T22:33:39Z But for the aficionados, an iridium nib is a statement. Why are fountain pen sales rising? 2012-05-22T11:07:45Z The Anthropocene's equivalent of the element iridium is nitrogen Iridium is a metal which is rare in our planet's crust but more abundant in many asteroids and meteorites. Leaving our mark: Fossils of the future 2012-11-03T00:34:29Z Despite the cost and relative scarcity of precious metals — iridium, platinum, rhodium — we rely on them to manufacture products from denim to beer, pharmaceuticals to fuel cells. Modern-Day Alchemy Has Iron Working Like Platinum 2012-10-15T20:02:01Z Platinum, iridium and the rest are expensive precisely because they are rare. Mining asteroids: Going platinum 2012-04-26T15:02:43Z In the top of the cap is a sapphire bearing, which rests on an iridium point projecting upward from the compass bowl. Lord Kelvin An account of his scientific life and work 2012-04-06T02:00:32.097Z The black may be got from the mixture of various oxides, but the best is that made from the oxide of iridium. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z Plat′inoid, one of the metals with which platinum is always found associated—palladium iridium, &c.; Chambers's Twentieth Century Dictionary (part 3 of 4: N-R) 2012-01-30T03:00:13.887Z Yet it actually changes, thanks to an old-fashioned way of defining it as the mass of a more-than-120-year-old cylinder of platinum and iridium that lives in a vault in the outskirts of Paris. Frontier experiments: Tough science 2012-01-04T18:20:13.233Z Have these been found, alongside of gold, diamonds, platinum, osmium, iridium, or mercury? Narrative of the Circumnavigation of the Globe by the Austrian Frigate Novara, Volume I (Commodore B. Von Wullerstorf-Urbair,) Undertaken by Order of the Imperial Government in the Years 1857, 1858, & 1859, Under the Immediate Auspices of His I. and R. Highness the Archduke Ferdinand Maximilian, Commander-In-Chief of the Austrian Navy. 2012-01-02T03:00:25.873Z But then they and other researchers found an overabundance of iridium in geological formations at the 65-million-year transition line between the Cretaceous and Tertiary periods, known as the K-T boundary. Case Closed for Dino Killer? 2011-07-13T00:04:00Z But electronics are a mainstay for companies like ERI, especially since many contain "precious metals" like platinum, iridium and others that could have large implications for energy independence and renewable energy in the United States. Urban Mining May Help Dispose of E-Waste 2011-04-22T15:15:03.637Z There are several rare metals, such as iridium and osmium, which would likewise be far too valuable to circulate. Readings in Money and Banking Selected and Adapted 2011-02-01T03:00:14.553Z The antiprotons themselves, which are produced by smashing regular protons into a piece of iridium, are around 100 billion times more energetic than this. Antimatter: Gotcha! 2010-11-18T11:27:00Z Using the darkest lens with a gray base and black iridium coating should help the miners' eyes adjust to bright light after being dilated so long, the California company said in a statement. Sports sunglasses aim to ease miners' transition 2010-10-13T18:26:00Z These indicators include a thin deposit of iridium as well as a marked change in the species of plant pollen found below and above the boundary, such as a sharp increase in fern species. Case Closed for Dino Killer? 2011-07-13T00:04:00Z The researchers are also seeking a catalyst that is cheaper than one based on iridium, which is relatively expensive. Artificial photosynthesis: A sunnier outlook 2010-04-29T11:22:00Z Bredig has in this way prepared sols of platinum, palladium, iridium, silver, and cadmium. The Mechanism of Life The metal iridium is sold at a very high price because it is wanted for making the tips of gold pens, and can be got only in small quantities. Political economy Platinum and iridium are found in the Ural Mountains, in Brazil, California, and Ceylon. Harper's Round Table, July 23, 1895 The best metal for contacts, if they are to bear hard usage, is either silver or gold or a mixture of 40% iridium with 60% of platinum. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" Before that it was Callisto, where he had struck it rich in the iridium fields; anyway, rich enough to keep him supplied with tsith for a year. One Purple Hope! Platinum, iridium, and osmium are obtained with the gold in some of the placer mines, but are never found alone, nor are they ever the main object sought by the miner. Hittel on Gold Mines and Mining There are small percentages of platinum, iridium, and other elements, but it is more than nine-tenths pure silver. Astounding Stories of Super-Science, August 1930 Platinum is used in telegraph keys, and iridium, being very hard, for nibs in the ends of gold pens. Harper's Round Table, July 23, 1895 We've got to get the iridium out of the hold and into the liner as soon as possible, or we'll be sighted by some other craft. The Space Rover Most of all he thought of Callisto and the iridium fields, which would mean much more tsith. One Purple Hope! It would pay in ingots of iridium and uranium and tungsten—and gold if Weald wished it—for all damages Weald might claim. Pariah Planet He saw neat stacks of gold ingots, new, freshly smelted; bars of silver-white iridium, of argent platinum, of blue-white osmium. Salvage in Space These are platinum, gold, tungsten, mercury, lead, palladium, silver, bismuth, uranium, vanadium, copper, cadmium, cobalt, arsenic, nickel, iron, molybdenum, tin, zinc, antimony, tellurium, manganese, tatiaum, chromium, columbium, rhodium, iridium, osmium, cerium. The Mines and its Wonders What he wanted was the insurance and the ten million dollars' worth of iridium in the hold as well. The Space Rover That'll be enough to get me out of here on the first freighter, and set up for another try at the Callisto iridium fields. One Purple Hope! They offered any price in heavy metals, gold, platinum, iridium, and so on. Pariah Planet This is usually found alloyed with iron and with other metals of the platinum group, especially iridium, rhodium, and palladium. The Economic Aspect of Geology Each was plated with iridium lest a speck of rust form and throw it off balance. Space Platform We can fuse with it iridium, the most refractory of metals, or we can produce with it the dazzling electric light, and that at any terrestrial distance from the battery itself. Fragments of science, V. 1-2 I guess it's the filth within these croupier types that makes them surround themselves with the aseptic immaculacy of iridium and glass. Vigorish It could be iridium or platinum, of course. The Bramble Bush Most of the platinum as used in jewelry and for electrical purposes contains iridium, which serves to harden it. The Economic Aspect of Geology And if we cut too far down we can plate the bearing up to thickness and cut it down again——” “Plate it up with iridium,” said the Chief. Space Platform He then fused iridium, the alloy of iridium and osmium, and other refractory substances. Fragments of science, V. 1-2 The rare metal iridium affords a blue which is a mixture of the oxide and the sesquioxide. Field's Chromatography or Treatise on Colours and Pigments as Used by Artists "They must have had the current tuned to iridium, and had to experiment until they found the right wave for steel," Seaton explained. The Skylark of Space Platinum group coming out now, I think—platinum, rhodium, iridium, and that gang, you know. Spacehounds of IPC The metals of the other group—iridium, osmium, and platinum—have atomic weights near 200 and densities near 21. An Elementary Study of Chemistry When sent through a short bar of iridium, this refractory metal emits a light of extraordinary splendour. Fragments of science, V. 1-2 If the dice have bits of iridium stuck under the six spots, they will throw aces. The Black Star Passes All their weapons are made of iridium, and all their most highly-tempered tools, such as their knives, razors, and so on, are made of opaque arenak. The Skylark of Space This whole planet is built of platinum, iridium, and noble alloys—the only substances known that will literally last forever. Spacehounds of IPC The four elements gold, platinum, osmium, and iridium are the heaviest substances known, being about twice as heavy as lead. An Elementary Study of Chemistry The branch currents may be employed to raise to vivid incandescence a refractory metal like iridium or one of its alloys. Fragments of science, V. 1-2 The other is composed of expensive metals such as platinum wire, and a wire of an alloy of platinum with 10 per cent of rhodium or iridium. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel The native alloy of osmium and iridium does not alloy with gold, however, but falls to the bottom of the molten metal. A Text-book of Assaying: For the Use of Those Connected with Mines. He also made thin rods of a mixture of finely divided metals such as platinum and iridium mixed with such oxides as magnesia, zirconia, and lime. Artificial Light Its Influence upon Civilization Some iridium is also precipitated as a similar compound. An Elementary Study of Chemistry The metal employed for the positive pole is an alloy containing 10 per cent. of iridium. Scientific American Supplement, No. 561, October 2, 1886 The metals platinum, iridium, rhodium, osmium and palladium do not fuse. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations They differ from gold, platinum, and iridium by the insolubility of their sulphides in a solution of sodium sulphide. A Text-book of Assaying: For the Use of Those Connected with Mines. Now, you ought to know that these metals, such as platinum, iridium, and palladium, have a strong affinity for such metals as lead and tin, and upon this a great deal depends. The Chemical History of a Candle The alloy used for it is iridium, which hardens it, and the more iridium it contains the more difficult it is to work, and consequently the more expensive. Scientific American Supplement, No. 458, October 11, 1884 The difference of the metals themselves, their origin, the causes of their locations, of their co-existence in the same ore—as, for instance, iridium, osmium, palladium, rhodium, and iron with platinum. Literary Remains, Volume 2 The metal palladium is found native, associated with iridium and platinum. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations The gold may contain an alloy of osmium and iridium; if so, it should be weighed and treated with aqua regia. A Text-book of Assaying: For the Use of Those Connected with Mines. We have the names in one of the tables arranged in two columns, representing, as you see, two groups—platinum, iridium, and osmium constituting one group; and ruthenium, rhodium, and palladium the other. The Chemical History of a Candle When pure, platinum is as soft as silver, but by the addition of iridium it becomes the hardest of metals. Scientific American Supplement, No. 458, October 11, 1884 Unfortunately the most refractory metals, such as platinum and alloys of platinum with iridium, fuse at a temperature of about 3450 degrees Fahrenheit. The Story of Electricity The ore of osmium and iridium can be decomposed, and the former recognized by its fetid odor. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations It always contains more or less silver, and, in alluvial sands, &c., may be associated with platinum and iridium. A Text-book of Assaying: For the Use of Those Connected with Mines. In that state of combination, as shewn in the table, the iridium and osmium are found combined in crystals, sometimes to the amount of 0.5 per cent., and sometimes 3 or 4 per cent. The Chemical History of a Candle Platinum and iridium are also common, and are exported from here to all parts of the world; they are in great demand by chemists and electricians. The Dominion in 1983 Gold pens with rhodium or iridium points were introduced soon afterwards. Forty Centuries of Ink or, a chronological narrative concerning ink and its backgrounds, introducing incidental observations and deductions, parallels of time and color phenomena, bibliography, chemistry, poetical effusions, citations, anecdotes and curiosa together with some evidence respecting the evanescent character of most inks of to-day and an epitome of chemico-legal ink. The latter metal, associated with platinum and iridium, has been found in South America. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations So with iridium and rhodium, and osmium and ruthenium, which are so closely allied that they make pairs, being separated each from its own group. The Chemical History of a Candle Alloys are compounded up to 25 per cent. of rhodium and iridium, by which the chemical inaction of the platinum is increased, and also its malleability and other physical properties. The Chemical History of a Candle It so happens, as he says, that iridium and rhodium do make the metal more capable of resisting the attacks of acids than platinum itself. The Chemical History of a Candle Gold pens are now usually tipped with iridium, making what are commonly known as diamond points. Forty Centuries of Ink or, a chronological narrative concerning ink and its backgrounds, introducing incidental observations and deductions, parallels of time and color phenomena, bibliography, chemistry, poetical effusions, citations, anecdotes and curiosa together with some evidence respecting the evanescent character of most inks of to-day and an epitome of chemico-legal ink. The iridium for this purpose is found in small grains of platinum, slightly alloyed with this latter metal. Forty Centuries of Ink or, a chronological narrative concerning ink and its backgrounds, introducing incidental observations and deductions, parallels of time and color phenomena, bibliography, chemistry, poetical effusions, citations, anecdotes and curiosa together with some evidence respecting the evanescent character of most inks of to-day and an epitome of chemico-legal ink. The under side of the point is notched by a small circular saw to receive the iridium point, which is selected with the aid of a microscope. Forty Centuries of Ink or, a chronological narrative concerning ink and its backgrounds, introducing incidental observations and deductions, parallels of time and color phenomena, bibliography, chemistry, poetical effusions, citations, anecdotes and curiosa together with some evidence respecting the evanescent character of most inks of to-day and an epitome of chemico-legal ink. This substance is always native—it is always in the metallic state; and the metals with which it is found connected, and which are rarely found elsewhere, are palladium, rhodium, iridium, osmium, and ruthenium. The Chemical History of a Candle |
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