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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=75483
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Title
Pressure-induced phase transition and pressure dependence of crystal structure in low (alpha) and Ca/Al-doped cristobalite.
Authors
Parise, J.B.;Yeganeh-Haeri, A.;Weidner, D.J.;Jorgensen, J.D.;Saltzberg, M.A.
Reference
IC&volume=75&fpage=136&details=yes target=icsd_help>Journal of Applied Physics (1994)
75
, 136-136
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Also:
Phase Transition (1992)
38
, 127-220
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Compound
O2 Si1
-
[Cristobalite low]
Silicon oxide
[
AX2
] [
tP12
] [
b a
] [
TeO2(alpha)
]
Cell
4.9780(1), 4.9780(1), 6.9321(1), 90., 90., 90.
P41212 (92)
V=171.78
Remarks
R=0.047000 : M =Cristobalite low : N P =39-1425 : =10 : T =298 : =TeO2(alpha) :
Metastable up to 500 K (2nd ref. , Tomaszewski), above Fd3-m
PDF 39-1425, 82-1403
Atom (site) Oxid.
x, y, z, B, Occupancy
Si1
(4a)
4
O1
(8b)
-2
0.30
0.30
0
0
1
0.23
0.10
0.17
0
1
Atom (site) Oxid.
U11, U22, U33, U12, U13, U23
Si1
(4a)
4
O1
(8b)
-2
0.00
0.00
0.00
0.00
-0.0
0.00
0.02
0.00
0.01
-0.0
0.00
0.00
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