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*data for ICSD #73450 Coll Code 73450 Rec Date 1994/06/30 Chem Name Potassium Tetrafluoroniccolate Structured K2 (Ni F4) Sum F4 K2 Ni1 ANX AB2X4 D(calc) 3.35 Title Electron-density distribution in a crystal of Dipotassium tetrafluoronickelate, K2NiF4 Author(s) Yeh, S.K.;Wu, S.Y.;Lee, C.-S.;Wang, Y. Reference Acta Crystallographica B (39,1983-) (1993), 49, 806-811 Unit Cell 4.0130(6) 4.0130(6) 13.088(2) 90. 90. 90. Vol 210.77 Z 2 Space Group I 4/m m m SG Number 139 Cryst Sys tetragonal Pearson tI14 Wyckoff e2 c a R Value .018 Red Cell I 4.013 4.013 7.132 106.338 106.338 89.999 105.386 Trans Red 1.000 0.000 0.000 / 0.000 -1.000 0.000 / -0.500 0.500 -0.500 Comments Accurate electron densities given Temperature in Kelvin: 300 Atom # OX SITE x y z SOF H K 1 +1 4 e 0 0 0.35377(2) 1. 0 Ni 1 +2 2 a 0 0 0 1. 0 F 1 -1 4 c 0 0.5 0 1. 0 F 2 -1 4 e 0 0 0.15331(7) 1. 0 Lbl Type U11 U22 U33 U12 U13 U23 K1 K1+ 0.01628(7) 0.01628(7) 0.01214(9) 0 0 0 Ni1 Ni2+ 0.00672(4) 0.00672(4) 0.00834(5) 0 0 0 F1 F1- 0.0155(3) 0.0075(2) 0.0182(3) 0 0 0 F2 F1- 0.0195(2) 0.0195(2) 0.0096(2) 0 0 0 *end for ICSD #73450 |

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