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

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 P 2 1 / c . The influence of t...

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Bibliographic Details
Published in:Physics of the solid state 2011-03, Vol.53 (3), p.510-517
Main Authors: Mikhaleva, E. A., Flerov, I. N., Bondarev, V. S., Gorev, M. V., Vasiliev, A. D., Davydova, T. N.
Format: Article
Language:English
Subjects:
Calorimetry
Comparative analysis
Ferroelectricity
Physics
Physics and Astronomy
Solid solutions
Solid State Physics
Sulfates
Toy industry
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Summary: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 P 2 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.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783411030188