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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Diamond cubic ： ウィキペディア英語版 Diamond cubic The diamond cubic crystal structure is a repeating pattern of 8 atoms that certain materials may adopt as they solidify. While the first known example was diamond, other elements in group 14 also adopt this structure, including α-tin, the semiconductors silicon and germanium, and silicon/germanium alloys in any proportion. ==Crystallographic structure== Diamond cubic is in the Fdm space group, which follows the face-centered cubic Bravais lattice. The lattice describes the repeat pattern; for diamond cubic crystals this lattice is "decorated" with a ''motif'' of two tetrahedrally bonded atoms in each primitive cell, separated by 1/4 of the width of the unit cell in each dimension.〔.〕 Many compound semiconductors such as gallium arsenide, β-silicon carbide, and indium antimonide adopt the analogous zincblende structure, where each atom has nearest neighbors of an unlike element. Zincblende's space group is F3m, but many of its structural properties are quite similar to the diamond structure.〔.〕 The atomic packing factor of the diamond cubic structure (the proportion of space that would be filled by spheres that are centered on the vertices of the structure and are as large as possible without overlapping) is $\backslash frac\; \backslash approx\; 0.34$,〔.〕 significantly smaller (indicating a less dense structure) than the packing factors for the face-centered and body-centered cubic lattices.〔.〕 Zincblende structures have higher packing factors than 0.34 depending on the relative sizes of their two component atoms. The first, second, third and fourth nearest-neighbor distances in units of the cubic lattice constant are $\backslash frac$, $\backslash frac$, $1$, and $\backslash frac$, respectively. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Diamond cubic」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.