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NdFeB晶胞中各原子的晶格位置
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对于烧结Nd2Fe14B磁体的空间结构,我只查到其具有四方结构,空间群为P42/mnm。一个晶胞由四个Nd2Fe14B 分子组成,含有68个原子,分布在9个晶位上。Nd 原子占两个晶位(4f、4g),Fe 原子占六个晶位(16K1、16K2、8J1、8J2、4e、4c),B原子占一个晶位(4g)。 我想知道Nd、Fe和B原子在晶胞中的原子位置,如(0,0,0),(0,0.5,0.5),以便建立其周期性3D结构。 [ Last edited by qhdzqy on 2008-3-2 at 18:26 ] |
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xiexie99
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*data for ICSD #44294 Coll Code 44294 Rec Date 2000/07/15 Mod Date 2003/10/01 Chem Name Neodymium Iron Boride (2/14/1) Structured Nd2 Fe14 B Sum B1 Fe14 Nd2 ANX NO2P14 D(calc) 7.6 Title Structural and magnetic properties of Nd2 Fe14 B Author(s) Herbst, J.F.;Croat, J.J.;Yelon, W.B. Reference Journal of Applied Physics (1984), 57, 4086-4090 Journal of Applied Physics (1986), 60, 4424-4429 Phase Transition (1992), 38, 127-220 Unit Cell 8.803(1) 8.803 12.196(1) 90. 90. 90. Vol 945.1 Z 4 Space Group P 42/m n m SG Number 136 Cryst Sys tetragonal Pearson tP68 Wyckoff k2 j2 g2 f e c R Value 0.028 Red Cell P 8.803 8.803 12.196 90 90 90 945.102 Trans Red 1.000 0.000 0.000 / 0.000 1.000 0.000 / 0.000 0.000 1.000 Comments PDF 39-473 R(magnetic)=0.030 Stable up to 600 K (2nd ref., Tomaszewski) PDF 36-1296, 70-1385 Neutron diffraction (powder) The structure has been assigned a PDF number: 36-1296 Atom # OX SITE x y z SOF H ITF(B) Nd 1 +0 4 f 0.2679(5) 0.2679 0 1. 0 0.6 Nd 2 +0 4 g 0.1403(4) -.1403 0 1. 0 0.6 Fe 1 +0 4 c 0 0.5 0 1. 0 0.6 Fe 2 +0 4 e 0 0 0.3861 1. 0 0.6 Fe 3 +0 8 j 0.3167(3) 0.3167 0.2464(3) 1. 0 0.6 Fe 4 +0 8 j 0.0979(3) 0.0979 0.2045(2) 1. 0 0.6 Fe 5 +0 16 k 0.0375(3) 0.3598(3) 0.1758(2) 1. 0 0.6 Fe 6 +0 16 k 0.2234(3) 0.5673(3) 0.1274(2) 1. 0 0.6 B 1 +0 4 g 0.3711(9) -.3711 0 1. 0 1.6(2) *end for ICSD #44294 |
3楼2008-03-03 08:17:46
xiexie99
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*data for ICSD #41393 Coll Code 41393 Rec Date 1999/11/30 Mod Date 2003/10/01 Chem Name Neodymium Iron Boride (2/14/1) Structured Nd2 Fe14 B Sum B1 Fe14 Nd2 ANX NO2P14 D(calc) 7.6 Title Cobalt site preferences in iron rare-earth-based compounds Author(s) Liao, L.X.;Altounian, Z.;Ryan, D.H. Reference Physical Review, Serie 3. B - Condensed Matter (18,1978-) (1993), 47, 11230-11241 Phase Transition (1992), 38, 127-220 Unit Cell 8.800(5) 8.800(5) 12.200(7) 90. 90. 90. Vol 944.77 Z 4 Space Group P 42/m n m SG Number 136 Cryst Sys tetragonal Pearson tP68 Wyckoff k2 j2 g2 f e c Red Cell P 8.8 8.8 12.2 90 90 90 944.768 Trans Red 1.000 0.000 0.000 / 0.000 1.000 0.000 / 0.000 0.000 1.000 Comments Co-occupations of Fe-sites in 57Co-doped samples (about 1 ppm Co): (% of total Co contents) 7.53, 6.36, 19.9, 2.95, 27.2, 36.1 Stable up to 600 K (2nd ref., Tomaszewski) NMR spectroscopy data given The structure has been assigned a PDF number: 39-473 No R value given in the paper. Atom # OX SITE x y z SOF H ITF(B) Fe 1 +0 4 e 0.5 0.5 0.114 1. 0 0.5 Fe 2 +0 4 c 0 0.5 0 1. 0 0.6 Fe 3 +0 8 j 0.098 0.098 0.204 1. 0 0.5 Fe 4 +0 8 j 0.317 0.317 0.246 1. 0 0.6 Fe 5 +0 16 k 0.223 0.567 0.127 1. 0 0.6 Fe 6 +0 16 k 0.037 0.36 0.176 1. 0 0.6 Nd 1 +0 4 f 0.268 0.268 0 1. 0 0.5 Nd 2 +0 4 g 0.14 -.14 0 1. 0 0.5 B 1 +0 4 g 0.371 -.371 0 1. 0 1.4 *end for ICSD #41393 |
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