This article is cited in 6 papers

Lattice dynamics

Investigation into phase diagrams of the fluorine-oxygen system: Ferroelastic-antiferroelectric (NH$_4$)$_2$WO$_2$F$_4$–(NH$_4$)$_2$MoO$_2$F$_4$

E. V. Bogdanov^ab, E. I. Pogoreltsev^ac, S. V. Melnikova^a, M. V. Gorev^ac, I. N. Flerov^ac, M. S. Molokeev^a, A. V. Kartashev^a, A. G. Kocharova^a, N. M. Laptash<sup>d

a</sup> L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b Krasnoyarsk State Agricultural University
^c Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk
^d Institute of Chemistry, Far East Branch of the Russian Academy of Sciences, Vladivostok

Abstract: Thermal, physical, structural, optical, and dielectric investigations have been performed for oxyfluoride solid solutions (NH$_4$)$_2$W$_{1-x}$Mo$_x$O$_2$F$_4$ ($x$ = 0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1). The character of the influence of the chemical and hydrostatic pressures on the stability of the parent (space group Cmcm) and distorted ferroelastic and antiferroelectric phases has been determined by analyzing the temperature-pressure, unit cell volume-composition, and temperature-composition phase diagrams. The specific features of the nature and mechanism of the phase transitions have been discussed using the available data on the structural, entropy, and dielectric parameters.

Received: 10.07.2012

 English version: Physics of the Solid State, 2013, 55:2, 409–418

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