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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=74266
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Title
Critical hole density for superconductivity in Sr-containing phases related to YBa2Cu3O7. Structure, superconductivity and cation substitution in YSr2Cu2.8Cr0.2O7.
Authors
Babu, T.G.N.;Greaves, C.
Reference
Physica C (1993)
207
, 44-50
Link
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Compound
Ba0.5 Ca0.2 Cr0.2 Cu2.8 O6.84 Sr1.5 Y0.8
- Yttrium calcium strontium barium copper chromium oxide (0.8/0.2/1.5/0.5/2.8/0.2/6.84)
[
ABC2D2X7
] [
tP13
] [
s n2 l i h g d
] [
]
Cell
3.8384(2), 3.8384(2), 11.4764(9), 90., 90., 90.
P4/MMM (123)
V=169.09
Remarks
R=0.026000 : M =Cu : N D
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.
Atom (site) Oxid.
x, y, z, B, Occupancy
Y1
(1d)
3
Ca1
(1d)
2
Sr1
(2h)
2
Ba1
(2h)
2
Cu1
(4l)
2.01
Cr1
(4l)
3
Cu2
(2g)
2.34
O1
(4n)
-2
O2
(4n)
-2
O3
(4i)
-2
O4
(8s)
-2
0.5
0.5
0.5
0.49
0.8
0.5
0.5
0.5
0.49
0.2
0.5
0.5
0.19
1.89
0.75
0.5
0.5
0.19
1.89
0.25
0.03
0
0
1.0(
0.2
0.03
0
0
1.0(
0.05
0
0
0.35
0.45
1
0.08
0.5
0
1.0(
0.13
0.23
0.5
0
1.0(
0.07
0.5
0
0.37
0.73
1
0.03
0
0.15
1.8(
0.25
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