This article is cited in 17 papers

Phase transitions

Structure transformations during phase transitions in the K$_3$WO$_3$F$_3$ oxyfluoride

M. S. Molokeev^a, S. V. Misjul^b, V. D. Fokina^a, A. G. Kocharova^a, K. S. Aleksandrov<sup>ab

a</sup> L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b Siberian Federal University, Krasnoyarsk

Abstract: The structures of three phases of the K$_3$WO$_3$F$_3$ crystal have been determined from X-ray diffraction data obtained for a powder sample. The profile and structural parameters have been refined according to the technique implemented in the DDM program. The results obtained have been discussed using the group-theoretical analysis of the complete order parameter condensate, which takes into account the critical and noncritical atomic displacements and allows the interpretation of the experimental data. The sequence of structural transformations is found to be as follows:
$$ Fm\bar{3}m \underset{(\eta1,0,0)}{\overset{(11-10)\Gamma_4^-}{\longrightarrow}} I4mm \underset{(\eta1,\eta2,0)}{\overset{(11-10)\Gamma_4^-}{\longrightarrow}} Cm. $$


Received: 11.08.2010

 English version: Physics of the Solid State, 2011, 53:4, 834–839

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