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Mechanism of phase transitions in the (NH4)2WO2F4 ferroelastic |
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| Authors: | I N Flerov V D Fokina M V Gorev A D Vasiliev A F Bovina M S Molokeev A G Kocharova N M Laptash |
| Institution: | (1) Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russia;(2) Institute of Chemistry, Far Eastern Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia |
| Abstract: | Precision studies of the thermophysical properties and structure of an (NH4)2WO2F4 crystal have been performed. It was established reliably that there is a sequence of two phase transitions at T 1 = 201 K and T 2 = 160 K characterized by wedging out of an intermediate phase with an increase in pressure. The role of tetrahedral and octahedral ionic groups in the mechanism of the structural transitions was determined. |
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