| 4 | 1/1 | 返回列表 |
| 查看: 4274 | 回復: 3 | |||
[交流]
弱弱的問一下什么叫Niggli-reduced Cell?
|
| 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?我是在用diamon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:
+2/176
+1/163
+1/91
+1/85
+1/33
+1/32
+1/23
+1/15
+1/11
+1/10
+1/7
+1/6
+1/5
+1/3
+1/3
+1/2
+2/2
+1/2
+1/1
+1/1
|
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 |
| 4 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 0817 化學工程 299分求調(diào)劑 有科研經(jīng)歷 有二區(qū)文章 +21 | rare12345 2026-03-18 | 21/1050 |
|
|---|---|---|---|---|
|
[考研] 工科材料085601 279求調(diào)劑 +6 | 困于星晨 2026-03-17 | 8/400 |
|
|
[考研] 288求調(diào)劑 +15 | 于海海海海 2026-03-19 | 15/750 |
|
|
[考研] 梁成偉老師課題組歡迎你的加入 +9 | 一鴨鴨喲 2026-03-14 | 11/550 |
|
|
[考研] 求調(diào)劑,一志愿:南京航空航天大學大學 ,080500材料科學與工程學碩,總分289分 +3 | @taotao 2026-03-19 | 3/150 |
|
|
[考研] 化學求調(diào)劑 +3 | 臨澤境llllll 2026-03-17 | 4/200 |
|
|
[考研] 一志愿 西北大學 ,070300化學學碩,總分287,雙非一本,求調(diào)劑。 +3 | 晨昏線與星海 2026-03-19 | 3/150 |
|
|
[考研] 本科鄭州大學物理學院,一志愿華科070200學碩,346求調(diào)劑 +4 | 我不是一根蔥 2026-03-18 | 4/200 |
|
|
[考研] 收復試調(diào)劑生 +4 | 雨后秋荷 2026-03-18 | 4/200 |
|
|
[考研] 生物學071000 329分求調(diào)劑 +3 | 我愛生物生物愛?/a> 2026-03-17 | 3/150 |
|
|
[考研] 290求調(diào)劑 +3 | p asserby. 2026-03-15 | 4/200 |
|
|
[考研] 藥學383 求調(diào)劑 +3 | 藥學chy 2026-03-15 | 4/200 |
|
|
[考研] 機械專碩325,尋找調(diào)劑院校 +3 | y9999 2026-03-15 | 5/250 |
|
|
[考研] 0854控制工程 359求調(diào)劑 可跨專業(yè) +3 | 626776879 2026-03-14 | 9/450 |
|
|
[考研] 326求調(diào)劑 +4 | 諾貝爾化學獎覬?/a> 2026-03-15 | 7/350 |
|
|
[考研] 0703 物理化學調(diào)劑 +3 | 我可以上岸的對?/a> 2026-03-13 | 5/250 |
|
|
[考研] 22408總分284求調(diào)劑 +3 | InAspic 2026-03-13 | 3/150 |
|
|
[考研] 中科大材料與化工319求調(diào)劑 +3 | 孟鑫材料 2026-03-14 | 3/150 |
|
|
[考研] 本科南京大學一志愿川大藥學327 +3 | 麥田耕者 2026-03-14 | 3/150 |
|
|
[考研] 311求調(diào)劑 +3 | 冬十三 2026-03-13 | 3/150 |
|