Phase Transitions and Fundamental Ferroelectric Dispersion in DMAAl1-xCrxS Crystals |
| V. Kapustianyka,b, Yu. Eliyashevskyy a, Z. Czapla c, S. Dacko c, O. Czupiński d, V. Rudyk b, R. Serkiz b, S. Sereda a and S. Semak a
aPhysical Department and bScientific-Technical and Educational Center of Low-Temperature Studies, Ivan Franko National University of Lviv, Dragomanova 50, UA-79005 Lviv, Ukraine cInstitute of Experimental Physics, University of Wrocław, pl. M. Borna 9, 50-204 Wrocław, Poland dFaculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland |
| Received: April 28, 2014; In final form: January 21, 2015 |
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| 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 DMAAl1-xCrxS. 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 Tc1. These changes are explained in terms of clusters sizes and dynamics in the framework of order-disorder type phase transition mechanism. |
DOI: 10.12693/APhysPolA.127.791 PACS numbers: 77.84.-s, 77.80.B-, 77.22.Gm, 65.40.Ba |