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CC=Collection Code: [AB2X4]=ANX Form: [cF56]=Pearson: [e d a]=Wyckoff Symbol: [Al2MgO4]=Structure Type:
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CC=40782 Help
TitlePreparation and crystal structure of U Cu As2.
AuthorsStepien-Damm, Yu.;Kaczorowski, D.;Troc, R.
ReferenceJournal of the Less-Common Metals (1987) 132, 15-19
Link XRef SCOPUS SCIRUS Google
Also: Journal of Solid State Chemistry (1995) 115, 305-308
Link XRef SCOPUS SCIRUS Google
CompoundAs2 Cu1 U1 - Copper uranium diarsenide [ABX2] [tP8] [c2 b a] []
Cell3.951(1), 3.951(1), 9.558(3), 90., 90., 90.
P4/NMMZ (129) V=149.2
RemarksR=0.048000 : PDF =39-1225 :
Calculated density unusual but tolerable.
At least one temperature factor is implausible or meaningless but agrees with the value given in the paper.
The coordinates are those given in the paper but the atomic distances do not agree with those calculated during testing.The coordinates are probably correct.
"Cells of RE-analogues: Y: 3.8862, 9.8710, La: 4.048, 10.27; Ce: 4.0181, 10.104; Pr: 3.9942, 10.068; Nd: 3.967, 10.055; Sm: 3.935, 9.972; Gd: 3.9105, 9.929; Tb: 3.8942, 9.879; Dy: 3.8820, 9.848; Ho: 3.8724, 9.822; Er: 3.8583, 9.789; Tm:"
"Tm: 3.8487, 9.769; Yb: 3.845, 9.745; Lu: 3.8342, 9.742 (2nd ref.)"
Cell from powder data: 3.948, 9.533

Atom (site) Oxid. x, y, z, B, Occupancy
U1(2c)4
Cu1(2b)2
As1(2a)-3
As2(2c)-3
0.250.250.2336(2)01
0.250.750.501
0.250.75001
0.250.250.6626(4)01
Atom (site) Oxid. B11, B22, B33, B12, B13, B23
U1(2c)4
Cu1(2b)2
As1(2a)-3
As2(2c)-3
0.11(1)0.11(1)0.18(3)000
1.0(1)1.0(1)0.4(1)000
0.44(6)0.44(6)0.07(9)000
0.22(3)0.22(3)0.4(1)000

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