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Phase Transitions and Fundamental Ferroelectric Dispersion in DMAAl_{1-x}Cr_{x}S Crystals

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Kapustianyk V., Eliyashevskyy Y., Czapla Z., Dacko S., Czupiński O., Rudyk V., Serkiz R., Sereda S., Semak S.

Acta Physica Polonica A

2015

vol. 127

issue 3

791-794

This paper presents the results of investigations of the temperature dependence of heat capacity and dielectric dispersion in the vicinity of ferroelectric-ferroelastic phase transition of dimethylammonium metal sulphate hexahydrate crystals DMAAl_{1-x}Cr_{x}S. In particular, it is shown that the isomorphous substitution of metal ion noticeably changes the temperature of phase transition and parameters of the fundamental ferroelectric dispersion observed around T_{c1}. These changes are explained in terms of clusters sizes and dynamics in the framework of order-disorder type phase transition mechanism.

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1 Acta Physica Polonica A

1 2015

1 Czapla Z.

1 Czupiński O.

1 Dacko S.

1 Eliyashevskyy Y.

1 Kapustianyk V.

1 Rudyk V.

1 Semak S.

1 Sereda S.

1 Serkiz R.

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Phase Transitions and Fundamental Ferroelectric Dispersion in DMAAl_{1-x}Cr_{x}S Crystals