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[交流]
弱弱的問一下什么叫Niggli-reduced Cell?
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| 如題,請問各位蟲友么,啥叫Niggli-reduced Cell(Niggli約化胞),這是什么東西,它和一般的Bravais點陣有什么關(guān)系。课沂窃谟胐iamon畫一個晶包的結(jié)構(gòu)圖時發(fā)現(xiàn)的,它給了我兩個數(shù)據(jù),其中一個就叫Niggli-reduced Cell,2個數(shù)據(jù)里面一些a,b,c,α,β,γ都不一樣么,求解????謝謝! |
» 搶金幣啦!回帖就可以得到:
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至尊木蟲 (著名寫手)
至尊木蟲 (著名寫手)
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從我個人理解,這個page闡述了Niggli在three-dimensional arithmetic crystal classes (symmorphic space groups)做出了很大的貢獻. 如果你查一下什么是symmorphic space groups, 你會得到下面的信息. Arithmetic crystal classes (73 in three dimensions). These are determined by the point group together with the action of the point group on the subgroup of translations. In other words the arithmetic crystal classes correspond to conjugacy classes of finite subgroup of the general linear group GLn(Z) over the integers. A space group is called symmorphic (or split) if there is a point such that all symmetries are the product of a symmetry fixing this point and a translation. Equivalently, a space group is symmorphic if it is a semidirect product of its point group with its translation subgroup. There are 73 symmorphic space groups, with exactly one in each arithmetic crystal class. There are also 157 nonsymmorphic space group types with varying numbers in the arithmetic crystal classes. 再和Bravais lattice 比較一下你就知道是什么區(qū)別了. http://en.wikipedia.org/wiki/Bravais_lattice |
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