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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=201893 Help
TitleA Structural Study of the Incommensurate-to-Ferroelectric Phase Transition in K2 Se O4.
AuthorsYamada, N.;Ono, Y.;Ikeda, T.
ReferenceIC&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
CompoundK2 O4 Se1 - Dipotassium selenate(VI) - ferroelectric phase [AB2X4] [oP84] [a21] []
Cell22.716, 10.339, 5.967, 90., 90., 90.
PNA21 (33) V=1401.41
RemarksR=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
0.050.070.2501
0.380.070.2401
0.720.080.2201
-.000.700.2701
0.330.700.2301
0.660.700.2401
0.070.410.2401
0.400.410.2601
0.740.420.2401
0.100.340.0301
0.420.340.0301
0.750.320.0201
0.090.330.4601
0.430.330.4801
0.770.350.4801
0.100.560.2601
0.440.550.2501
0.770.560.2001
0.000.430.2201
0.330.430.2901
0.660.420.2701
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
0.000.000.00-.00-.00-.00
0.000.000.000.000.000.00
0.000.000.000.000.00-.00
0.000.000.000.00-.00-.00
0.000.000.00-.000.000.00
0.000.000.000.000.000.00
0.000.000.000.00-.00-.00
0.000.000.00-.000.000.00
0.000.000.00-.00-.00-.00
0.000.000.000.000.00-.00
0.000.000.000.00-.00-.00
0.000.000.000.000.00-.00
0.000.000.000.00-.000.00
0.000.000.000.000.000.00
0.000.000.000.00-.000.00
0.000.000.00-.00-.000.00
0.000.000.00-.00-.000.00
0.000.000.00-.000.000.00
0.000.000.000.000.00-.00
0.000.000.000.00-.000.00
0.000.000.000.000.00-.00

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