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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
A Structural Study of the Incommensurate-to-Ferroelectric Phase Transition in K2 Se O4.
Authors
Yamada, N.;Ono, Y.;Ikeda, T.
Reference
IC&volume=53&fpage=256&details=yes target=icsd_help>Journal of the Physical Society of Japan (1984)
53
, 256-257
Link
XRef
SCOPUS
Google
Also:
Phase Transition (1992)
38
, 127-220
Link
XRef
SCOPUS
Google
Compound
K2 O4 Se1
- Dipotassium selenate(VI) - ferroelectric phase
[
AB2X4
] [
oP84
] [
a21
] [
]
Cell
22.716, 10.339, 5.967, 90., 90., 90.
PNA21 (33)
V=1401.41
Remarks
R=0.038000 : T P =84-967 :
At least one temperature factor is implausible or meaningless but agrees with the value given in the paper.
Stable from 56 to 93 K (2nd ref., Tomaszewski), above Pnam
Atom (site) Oxid.
x, y, z, B, Occupancy
K1
(4a)
1
K2
(4a)
1
K3
(4a)
1
K4
(4a)
1
K5
(4a)
1
K6
(4a)
1
Se1
(4a)
6
Se2
(4a)
6
Se3
(4a)
6
O1
(4a)
-2
O2
(4a)
-2
O3
(4a)
-2
O4
(4a)
-2
O5
(4a)
-2
O6
(4a)
-2
O7
(4a)
-2
O8
(4a)
-2
O9
(4a)
-2
O10
(4a)
-2
O11
(4a)
-2
O12
(4a)
-2
0.05
0.07
0.25
0
1
0.38
0.07
0.24
0
1
0.72
0.08
0.22
0
1
-.00
0.70
0.27
0
1
0.33
0.70
0.23
0
1
0.66
0.70
0.24
0
1
0.07
0.41
0.24
0
1
0.40
0.41
0.26
0
1
0.74
0.42
0.24
0
1
0.10
0.34
0.03
0
1
0.42
0.34
0.03
0
1
0.75
0.32
0.02
0
1
0.09
0.33
0.46
0
1
0.43
0.33
0.48
0
1
0.77
0.35
0.48
0
1
0.10
0.56
0.26
0
1
0.44
0.55
0.25
0
1
0.77
0.56
0.20
0
1
0.00
0.43
0.22
0
1
0.33
0.43
0.29
0
1
0.66
0.42
0.27
0
1
Atom (site) Oxid.
Beta11, Beta22, Beta33, Beta12, Beta13, Beta23
K1
(4a)
1
K2
(4a)
1
K3
(4a)
1
K4
(4a)
1
K5
(4a)
1
K6
(4a)
1
Se1
(4a)
6
Se2
(4a)
6
Se3
(4a)
6
O1
(4a)
-2
O2
(4a)
-2
O3
(4a)
-2
O4
(4a)
-2
O5
(4a)
-2
O6
(4a)
-2
O7
(4a)
-2
O8
(4a)
-2
O9
(4a)
-2
O10
(4a)
-2
O11
(4a)
-2
O12
(4a)
-2
0.00
0.00
0.00
-.00
-.00
-.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.00
-.00
-.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
-.00
-.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.00
0.00
-.00
-.00
-.00
0.00
0.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.00
-.00
-.00
0.00
0.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.00
-.00
-.00
0.00
0.00
0.00
0.00
-.00
-.00
0.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.00
0.00
0.00
-.00
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