This article is cited in 21 papers

Ferroelectricity

Phase transitions and caloric effects in ferroelectric solid solutions of ammonium and rubidium hydrosulfates

E. A. Mikhaleva^ab, I. N. Flerov^ab, V. S. Bondarev^ab, M. V. Gorev^ab, A. D. Vasil'ev^ab, T. N. Davydova<sup>b

a</sup> 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

Abstract: Structural, calorimetric, dielectric, and electrocaloric investigations of Rb$_x$(NH$_4$)$_{1-x}$HSO$_4$ ferroelectric solid solutions have been performed. It has been found that rubidium atoms inhomogeneously occupy nonequivalent crystallographic positions in the structure $P2_1/c$. The influence of the rubidium concentration on the sequence of phase transitions in the NH$_4$HSO$_4$ compound has been established. It has been revealed that the consequences of the Landau theory can be applied to the description of the temperature dependences of the anomalous heat capacity and the electrocaloric effect over a wide range of temperatures. Comparative evaluations of the electrocaloric and barocaloric effects in hydrosulfate and triglycine sulfate crystals have been carried out.

Received: 24.06.2010

 English version: DOI: 10.1134/S1063783411030188

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