Premium
Dielectric Relaxation in High Temperature Phases of (NH 3 C 2 H 5 ) 2 CuCl 4 Crystals
Author(s) -
Korchak Yu.,
Kapustianik V.,
Tchukvinskyi R.,
Czapla Z.,
Dacko S.,
Bazhan V.
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<777::aid-pssb777>3.0.co;2-l
Subject(s) - dielectric , relaxation (psychology) , dispersion (optics) , cole–cole equation , condensed matter physics , activation energy , phase transition , materials science , phase (matter) , debye , dielectric dispersion , dielectric spectroscopy , nuclear magnetic resonance , chemistry , permittivity , optics , physics , psychology , social psychology , optoelectronics , organic chemistry , electrode , electrochemistry
On the basis of dielectric investigations of (NH 3 C 2 H 5 ) 2 CuCl 4 crystals the existence of phase transitions at T 1 = 364 K and T 2 = 356 K (in a heating run) was confirmed. In the temperature region of 300–370 K Debye relaxation was observed. The change of the dielectric dispersion character around T 3 = 330 K is related to the phase transition. The determined values of the activation energy and the times of the dielectric relaxation for all phases are characteristic of the combined reorientation motions of the alkylammonium cation. The conclusions concerning the dynamics of the hydrogen bonds were confirmed by IR spectroscopy.