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Dielectric and optical properties related to phase transitions in an imidazolium perchlorate [C 3 N 2 H 5 ClO 4 ] crystal
Author(s) -
Czapla Z.,
Dacko S.,
Kosturek B.,
Was’︁kowska A.
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.200541249
Subject(s) - dielectric , ferroelectricity , phase transition , birefringence , crystallography , phase (matter) , materials science , crystal structure , hysteresis , perchlorate , diffraction , crystal (programming language) , analytical chemistry (journal) , chemistry , condensed matter physics , optics , ion , physics , optoelectronics , organic chemistry , programming language , computer science
Structural, dielectric and optical properties of the crystal C 3 N 2 H 5 ClO 4 have been studied by X‐ray diffraction, dielec‐tric and birefringence measurements. On cooling, structural phase transitions occurring at 373 K ( T c1 ) and 210 K ( T c2 ) are of second and first order, respectively. It is considered from the structure and the dielectric behaviour that Phases I ( T > T c1 ) and II ( T c2 < T < T c1 ) are paraelectric and ferroelectric, respectively, though a hysteresis loop is not found in Phase II. The crystal is destroyed below T c2 by a large structure deformation. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)