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Crystal Structure of K_{3}Na(SeO_{4})_{2} at 340 K

100%
Fukami T., Chen R.
Acta Physica Polonica A
|
1998
|
vol. 94
|
issue 5-6
795-801
EN
The crystal structure of tripotassium sodium diselenate, K_{3}Na(SeO_{4})_{2}, at 340 K is studied by single-crystal X-ray diffraction. The space group symmetry (trigonal P3̅) and structure parameters are determined. It is found that there exists the difference of the direction and the magnitude of the atomic displacement at the two phase transitions of 346 K and 334 K.
2
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Structural Phase Transition and Crystal Structure for (ND_4)_4D_2(SeO_4)_3 at Low Temperature

100%
Fukami T., Chen R.
Acta Physica Polonica A
|
2001
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vol. 100
|
issue 1
53-65
EN
Differential scanning calorimetry and X-ray diffraction measurements were performed on a deuterated tetraammonium dihydrogen triselenate (ND_4)_4D_2(SeO_4)_3 crystal at low temperatures. A structural phase transition is found at 182.0(3) K. The space group symmetry (triclinic P1) and the structure parameters are determined at 145 K in the low-temperature phase. The isotope effect for an asymmetric O-H-O hydrogen bond by the substitution of deuterium is discussed.
3
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Structural Study of (NH_{4})_{4}H_{2}(SeO_{4})_{3} in the Low-Temperature Phase

81%
Fukami T., Higa N., Chen R.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 4
663-670
EN
The crystal structure of tetraammonium dihydrogen triselenate, (NH_{4})_{4}H_{2}(SeO_{4})_{3}, in the low-temperature phase at 141 K is studied by X-ray diffraction. The space group symmetry (triclinic P1) and the structure parameters are determined. By the shift of the Se atom from the center of the SeO_{4} tetrahedron, it is suggested that the (NH_{4})_{4}H_{2} (SeO_{4})_{3} crystal in the low-temperature phase is ferroelectric with the electric dipole moment along the c-axis. The rotation of the SeO_{4} tetrahedron suggested by electron paramagnetic resonance measurements is discussed.
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