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Dielectric and Electrooptic Properties of the DMAMeS (Me = Al, Ga) Crystals in the Region of Low Temperature Phases
Author(s) -
Kapustianik V.,
Sveleba S.,
Stasyuk I.,
Velychko O.,
Czapla Z.,
Tchukvinskyi R.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200112)228:3<785::aid-pssb785>3.0.co;2-p
Subject(s) - dielectric , materials science , condensed matter physics , optics , optoelectronics , physics
This paper presents the results of investigations of the dielectric, birefringent and electrooptic properties of NH 2 (CH 3 ) 2 Me(SO 4 ) 2 · 6H 2 O (Me = Al, Ga) crystals. The data obtained are compared with the predictions of a phenomenological theory. In particular, the temperature behaviour of the dielectric susceptibility components and their anomalies in the vicinity of phase transition points were investigated in details. The specific behaviour of the studied parameters in the low temperature region was related to the coexistence of ferroelectric and antiferroelectric ordering of the dimethylammonium groups carrying a dipole moment.