| 单词 | rhombohedral |
| 例句 | The team carried out some simple calculations and found that some coordinated behavior among electrons should emerge in a structure of five graphene layers stacked together in a rhombohedral pattern. From a five-layer graphene sandwich, a rare electronic state emerges 2023-10-18T04:00:00Z More specifically, lead titanate changes shape from tetragonal to rhombohedral through monoclinic intermediates under pressure. Ferroelectric polymers morph into action 2018-10-02T04:00:00Z A stereographic projection of a rhombohedral crystal is given in fig. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z The habit of the crystals may be rhombohedral, pyramidal or tabular, rarely prismatic. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z GRAPHITE, a mineral species consisting of the element carbon crystallized in the rhombohedral system. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z They used optical techniques to examine each flake, looking specifically for five-layer flakes, arranged naturally in a rhombohedral pattern. From a five-layer graphene sandwich, a rare electronic state emerges 2023-10-18T04:00:00Z Crystals of arsenic belong to the rhombohedral system, and have a perfect cleavage parallel to the basal plane; natural crystals are, however, of rare occurrence, and are usually acicular in habit. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6 "Armour Plates" to "Arundel, Earls of" Hexagonal axes of reference are used: if rhombohedral axes be used many of the simple forms will have two sets of indices. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z The angle between the perfect rhombohedral cleavages is 73� 48′, the hardness 3� to 4, and the specific gravity 2.9 to 3.1; but these will vary slightly with the chemical composition. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Chalybite crystallizes in the rhombohedral system and is isomorphous with calcite; like this it possesses perfect cleavages parallel to the faces of the primitive rhombohedron, the angles between which are 73� 0′. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" "And we can look at all these flakes and tell which has five layers, in this rhombohedral stacking, which is what should give you this slowing-down effect in electrons." From a five-layer graphene sandwich, a rare electronic state emerges 2023-10-18T04:00:00Z The crystals belong to the hexagonal system, and are generally of rhombohedral habit, sometimes twinned. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" Those with a triad axis are grouped together in the rhombohedral or trigonal division, and those with a hexad axis in the hexagonal division. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z It was not common carbonate of lime, for the crystals were rhombohedral and did not show the cleavage of calcite. The Voyage of the Vega round Asia and Europe, Volume I and Volume II Gmelinite and levynite are other species of zeolites which may be mentioned here, since they are closely related to chabazite, and like it are rhombohedral and frequently twinned. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" Nothing here but illimitable mysteries, Baffling unknowledgeableness, Fathomless, fainting from square to square, Oblongs and nosey triangles, ever so nosey, Shapes rhomboidal, perchance rhombohedral—who knows? Punch, or the London Charivari, Vol. 146, February 25, 1914 Crystals of calcite are extremely varied in form, but, as a rule, they may be referred to four distinct habits, namely: rhombohedral, prismatic, scalenohedral and tabular. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" By some authors these two divisions are treated as separate systems; or again the rhombohedral forms may be considered as hemihedral developments 580 of the hexagonal. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z Another of these crystals, doubly terminated, measures 2½ inches by 11/12 of an inch, and is filled with large rhombohedral cavities, which formerly contained dolomite. Scientific American Supplement, No. 598, June 18, 1887 Dolomite occurs to a limited extent as such; most of it, being in the form of gurhofite crystals, may be occasionally found with aragonite of a light pearly gray color and rhombohedral crystals. Scientific American Supplement, No. 415, December 15, 1883 It is commonly massive, but occurs also in rhombohedral crystals. The Gutenberg Webster's Unabridged Dictionary Section M, N, and O It is rhombohedral in crystallization and isomorphous with calcite and chalybite. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" On the other hand, hexagonal forms may be considered as a combination of two rhombohedral forms. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z It occurs in splendent rhombohedral crystals, and in massive and earthy forms; — the last called red ocher. The Gutenberg Webster's Unabridged Dictionary Section F, G and H It is rhombohedral in its crystallization, and thus distinguished from aragonite. The Gutenberg Webster's Unabridged Dictionary Section C There are two forms occurring there, the most abundant of which is the rhombohedral, after Fig. Scientific American Supplement, No. 344, August 5, 1882 As in the other rhombohedral carbonates, the crystals possess perfect cleavages parallel to the faces of the rhombohedron. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" CALCITE, a mineral consisting of naturally occurring calcium carbonate, CaCO3, crystallizing in the rhombohedral system. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" The crystals measure up to a yard across, and are rhombohedral or scalenohedral in habit; their faces are usually dull and corroded or coated with stilbite. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" |
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