E. I. Pogoreltsev, E. V. Bogdanov, M. S. Molokeev, V. N. Voronov, L. I. Isaenko, S. A. Zhurkov, N. M. Laptash, M. V. Gorev, I. N. Flerov, “Thermodynamic properties and structure of oxyfluorides Rb$_2$KMoO$_3$F$_3$ and K$_2$NaMoO$_3$F$_3$”, Fizika Tverdogo Tela, 2011, Volume 53, Issue 6,Pages 1136

This article is cited in 8 papers

Dielectrics

Thermodynamic properties and structure of oxyfluorides Rb$_2$KMoO$_3$F$_3$ and K$_2$NaMoO$_3$F$_3$

E. I. Pogoreltsev^a, E. V. Bogdanov^b, M. S. Molokeev^b, V. N. Voronov^b, L. I. Isaenko^c, S. A. Zhurkov^c, N. M. Laptash^d, M. V. Gorev^ab, I. N. Flerov^ab

^a Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk
^b L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^c Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk
^d Institute of Chemistry, Far East Branch of the Russian Academy of Sciences, Vladivostok

Abstract: According to the results of calorimetric and structural studies, the $Fm\bar3m$ phase in K$_2$NaMoO$_3$F$_3$ remains stable at least to 100 K. No ferroelectric transformation assumed earlier has been revealed in a series of Rb$_2$KMoO$_3$F$_3$ samples prepared using various technologies. Only a phase transition of nonferroelectric origin has been observed near 195 K, and its thermodynamic characteristics have been determined. An analysis of the stability of the cubic structure of molybdenum fluorine-oxygen elpasolites-cryolites has been performed in the framework of the hypothesis on strengths of interatomic bonds. The barocaloric effect in Rb$_2$KMoO$_3$F$_3$ has been estimated.

Received: 22.11.2010