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  1. 1 Acta Physica Polonica A

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  1. 1 2000

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  1. 1 Chen R.

  2. 1 Fukami T.

  3. 1 Higa N.

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Structural Study of (NH_{4})_{4}H_{2}(SeO_{4})_{3} in the Low-Temperature Phase

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Fukami T., Higa N., Chen R.
Acta Physica Polonica A
|
2000
|
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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