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Dielectric and calorimetric studies of ferroelectric phase transitions in Li (2– x ) Na x Ge 4 O 9 crystals
Author(s) -
Cebula I.,
Cach R.
Publication year - 2005
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/pssb.200541057
Subject(s) - ferroelectricity , dielectric , phase transition , landau theory , phase (matter) , condensed matter physics , materials science , thermodynamics , calorimetry , chemistry , crystallography , physics , optoelectronics , organic chemistry
The ferroelectric phase transitions of LiNaGe 4 O 9 , Li 1.1 Na 0.9 Ge 4 O 9 , Li 1.2 Na 0.8 Ge 4 O 9 and Li 1.7 Na 0.3 Ge 4 O 9 crystals were studied. Experiments were carried out by means of classical dielectric measurements and using an AC calorimetric specific‐heat measuring system. Critical behaviour is explained within Landau theory. The expansion coefficients of the state equation are determined. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)