空间群

数学物理学中,空间群(space group)是空间中(通常是三维空间)一种形态的空间对称群。在三维空间中有219种不同的类型,或230种不同的手性类型。对超过三维的空间中的空间群也有研究,它们有时被称作比贝尔巴赫英语Ludwig Bieberbach,并且是离散的紧,具有欧氏空间的等距同构。它是由俄国结晶学家费多洛夫和德国结晶学家薛弗利斯(Artur Moritz Schoenflies,1853-1928)于1890至1891年间各自独立地先后推导得出来的。

晶体学中,空间群也被称为费奥多罗夫英语Evgraf Fedorov,是对晶体对称型的一种描述。三维空间群的权威参考文献是《国际晶体学表》。空间群可以分为两类:一类称为简单空间群或称点空间群;一类称为复杂空间群或称非点空间群。其中73种为简单空间群,余下的157种为复杂空间群。

三维的空间群

# 晶系
(空间群数量)
布拉维晶格
点群 空间群 (国际短符号)
國際標記法 熊夫利標記法英语Schoenflies notation[1] 軌形英语Orbifold 考克斯特符號英语Coxeter notation 點群階
1 三斜晶系
(2)
1 C1 11 [ ]+ 1 P1
2 1 Ci [2+,2+] 2 P1
3–5 单斜晶系
(13)
2 C2 22 [2]+ 2 P2, P21
C2
6–9 m Cs *11 [ ] 2 Pm, Pc
Cm, Cc
10–15 2/m C2h 2* [2,2+] 4 P2/m, P21/m
C2/m, P2/c, P21/c
C2/c
16–24 正交晶系
(59)

222 D2 222 [2,2]+ 4 P222, P2221, P21212, P212121, C2221, C222, F222, I222, I212121
25–46 mm2 C2v *22 [2] 4 Pmm2, Pmc21, Pcc2, Pma2, Pca21, Pnc2, Pmn21, Pba2, Pna21, Pnn2
Cmm2, Cmc21, Ccc2, Amm2, Aem2, Ama2, Aea2
Fmm2, Fdd2
Imm2, Iba2, Ima2
47–74 mmm D2h *222 [2,2] 8 Pmmm, Pnnn, Pccm, Pban, Pmma, Pnna, Pmna, Pcca, Pbam, Pccn, Pbcm, Pnnm, Pmmn, Pbcn, Pbca, Pnma
Cmcm, Cmce, Cmmm, Cccm, Cmme, Ccce
Fmmm, Fddd
Immm, Ibam, Ibca, Imma
75–80 四方晶系
(68)

4 C4 44 [4]+ 4 P4, P41, P42, P43, I4, I41
81–82 4 S4 [2+,4+] 4 P4, I4
83–88 4/m C4h 4* [2,4+] 8 P4/m, P42/m, P4/n, P42/n
I4/m, I41/a
89–98 422 D4 224 [2,4]+ 8 P422, P4212, P4122, P41212, P4222, P42212, P4322, P43212
I422, I4122
99–110 4mm C4v *44 [4] 8 P4mm, P4bm, P42cm, P42nm, P4cc, P4nc, P42mc, P42bc
I4mm, I4cm, I41md, I41cd
111–122 42m D2d 2*2 [2+,4] 8 P42m, P42c, P421m, P421c, P4m2, P4c2, P4b2, P4n2
I4m2, I4c2, I42m, I42d
123–142 4/mmm D4h *224 [2,4] 16 P4/mmm, P4/mcc, P4/nbm, P4/nnc, P4/mbm, P4/mnc, P4/nmm, P4/ncc, P42/mmc, P42/mcm, P42/nbc, P42/nnm, P42/mbc, P42/mnm, P42/nmc, P42/ncm
I4/mmm, I4/mcm, I41/amd, I41/acd
143–146 三方晶系
(25)
3 C3 33 [3]+ 3 P3, P31, P32
R3
147–148 3 S6 [2+,6+] 6 P3, R3
149–155 32 D3 223 [2,3]+ 6 P312, P321, P3112, P3121, P3212, P3221
R32
156–161 3m C3v *33 [3] 6 P3m1, P31m, P3c1, P31c
R3m, R3c
162–167 3m D3d 2*3 [2+,6] 12 P31m, P31c, P3m1, P3c1
R3m, R3c
168–173 六方晶系
(27)
6 C6 66 [6]+ 6 P6, P61, P65, P62, P64, P63
174 6 C3h 3* [2,3+] 6 P6
175–176 6/m C6h 6* [2,6+] 12 P6/m, P63/m
177–182 622 D6 226 [2,6]+ 12 P622, P6122, P6522, P6222, P6422, P6322
183–186 6mm C6v *66 [6] 12 P6mm, P6cc, P63cm, P63mc
187–190 6m2 D3h *223 [2,3] 12 P6m2, P6c2, P62m, P62c
191–194 6/mmm D6h *226 [2,6] 24 P6/mmm, P6/mcc, P63/mcm, P63/mmc
195–199 立方晶系
(36)


23 T 332 [3,3]+ 12 P23, F23, I23
P213, I213
200–206 m3 Th 3*2 [3+,4] 24 Pm3, Pn3, Fm3, Fd3, Im3, Pa3, Ia3
207–214 432 O 432 [3,4]+ 24 P432, P4232
F432, F4132
I432
P4332, P4132, I4132
215–220 43m Td *332 [3,3] 24 P43m, F43m, I43m
P43n, F43c, I43d
221–230 m3m Oh *432 [3,4] 48 Pm3m, Pn3n, Pm3n, Pn3m
Fm3m, Fm3c, Fd3m, Fd3c
Im3m, Ia3d

注: e 面是双滑移面,是在两个不同方向的滑移,存在于七个正交群,五个四方群和五个立方群中,都具有含有中心的晶格,官方的符号为e

参考资料

外部链接

  1. ^ 又名向夫立符號

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