Lattice dynamics and phase transitions

Barocaloric effect near the structural phase transition in the Rb$_2$KTiOF$_5$ oxyfluoride

M. V. Gorev^ab, I. N. Flerov^ab, E. V. Bogdanov^a, V. N. Voronov^a, N. M. Laptash<sup>c

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

Abstract: The barocaloric effect (BCE) in the oxyfluoride Rb$_2$KTiOF$_5$ has been studied in the vicinity of the structural phase transition at a temperature of 215 K in the pressure range 0–0.6 GPa. It has been established that the extensive and intensive barocaloric effects are $\Delta S_{\mathrm{BCE}}\approx$ -46 J/kg $\cdot$ K и $\Delta T_{\mathrm{AD}}\approx$ 18 K, respectively, over a wide temperature range 215–280 K. The studies performed have shown that the external hydrostatic pressure is a very effective tool for changing the entropy and temperature of the crystals which undergo structural phase transitions accompanied by a large change in the entropy.

Received: 09.06.2009

 English version: Physics of the Solid State, 2010, 52:2, 377–383

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