晶体结构 1课件.ppt

* * The 14 possible BRAVAIS LATTICES {note that spheres in this picture represent lattice points, not atoms!} 晶体结构与空间格子-C Crystal system Unit cell shape Essential symmetry Space lattices Cubi a=b=c a=b=g=90 Four threefold axes P I F Tetragonal a=b≠c a=b=g=90 One fourfold axis P I Orthorhombic a≠b≠c a=b=g=90 Three twofold axes or mirror plane P I F A(B or C) Hexagona A=b≠c a=g=90 b=120 One threefold axis P Trigonal A=b≠c a=g=90 b=120 One threefold axis P a=b=c a=b=g≠90 One threefold axis R Monoclinic a≠b≠c a=b=90 g≠90 One twofold axis or mirror plane P C Triclinic a≠b≠c a≠b≠g≠90 none P crystal Classes 图 2-1 密排六方的原子密堆和间隙 图 2-2 面心立方的原子密堆和间隙 图2-3 体心立方的间隙 图 2-5 NaCI型的晶体结构 NaCI, NaI, MgO, CaO, SrO, BaO, CdO, MnO, FeO, NiO, TiC, TiN, LaN, ZrN, CrN, SiN 图2-6 闪锌矿ZnS 和 萤石（CaF2）结构, 反萤石结构 ZnS, CBN, InSb, β-SiC,AlP, AsGa; ThO2, CeO2, PrO2, UO2, ZrO2, 反萤石结构：LiO2, Na2O, K2O 图 2-7 正、反尖晶石结构 MgAl2O4, FeAl2O4, CoAl2O3, ZnAl2O4, NiAl2O4 图2-8 β-SiO2 方英石结构 图2-9 刚玉结构： α-Al2O3 α -Fe2O3, Ti2O3, Cr2O3, V2O3, Ga2O3, Rh2O3, FeTiO3, LiSbO3 图 2-10 钎锌矿ZnS, AlN, BeO, CoSe的晶体结构 图2-11 AsNi的晶体结构， 图2-12 CsCI的晶体结构 FeS, FeSe, CoSe, CsBr, CsI