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[求助]
關(guān)于ICSD里晶體資料的問題
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我在ICSD中查找BaTiO3的數(shù)據(jù) 結(jié)果如下 *data for ICSD #6102 Coll Code 6102 Rec Date 1980/01/01 Mod Date 2002/04/01 Chem Name Barium Trioxotitanate Structured Ba (Ti O3) Sum Ba1 O3 Ti1 ANX ABX3 D(calc) 6.04 Title Strucure of rhomboedral ferroelectric barium titanate Author(s) Hewat, A.W. Reference Ferroelectrics (1974), 6, 215-218 Phase Transition (1992), 38, 127-220 Unit Cell 4.001 4.001 4.001 89.85 89.85 89.85 Vol 64.05 Z 1 Space Group R 3 m R SG Number 160 Cryst Sys trigonal/rhombohedral Pearson hR5 Wyckoff b a2 R Value .0186 Red Cell RR 4.001 4.001 4.001 89.85 89.85 89.85 64.047 Trans Red 1.000 0.000 0.000 / 0.000 1.000 0.000 / 0.000 0.000 1.000 Comments Stable below 183 K (2nd ref.) The structure has been assigned a PDF number: 85-368 At least one temperature factor is implausible or meaningless but agrees with the value given in the paper. Atom # OX SITE x y z SOF H ITF(B) Ba 1 +2 1 a 0.013(3) 0.013(3) 0.013(3) 1. 0 0.26 Ti 1 +4 1 a 0.5 0.5 0.5 1. 0 0.1 O 1 -2 3 b 0.524(2) 0.524(2) 0.031(2) 1. 0 0.25 *end for ICSD #6102 為什么最后的原子位置只給出了3個原子。請問怎么看這個原子坐標(biāo)? |
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