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CC=Collection Code: [AB2X4]=ANX Form: [cF56]=Pearson: [e d a]=Wyckoff Symbol: [Al2MgO4]=Structure Type:
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Title
Structure determination of erbium pyrosilicate.
Authors
Smolin, Yu.I.;Shepelev, Yu.F.
Reference
Izvestiya Akademii Nauk SSSR, Neorganich (1968)
4
, 113-113
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Also:
Phase Transition (1992)
38
, 127-220
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Compound
Er2 O7 Si2
- Dierbium disilicate
[
A2B2X7
] [
mP22
] [
e5 d
] [
]
Cell
4.683(5), 5.556(5), 10.79(1), 90., 90., 96.
P1121/B (14)
V=279.2
Remarks
R=0.062000 : P =25-1416 :
Calculated density unusual but tolerable.
Cell of HoSi2O7: 4.686, 5.580, 10.84, 95.97
Stable below 1323 K (2nd ref., Tomaszewski), cp. 74779
Atom (site) Oxid.
x, y, z, B, Occupancy
Er1
(4e)
3
Si1
(4e)
4
O1
(2d)
-2
O2
(4e)
-2
O3
(4e)
-2
O4
(4e)
-2
0.88
0.09
0.34
0.28
1
0.36
0.64
0.38
0.33
1
0.5
0.5
0.5
0.91
1
0.20
0.86
0.44
0.64
1
0.12
0.45
0.31
0.62
1
0.61
0.75
0.29
0.55
1
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