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Electron–Phonon Interaction and Phase Transitions in [C 2 H 5 NH 3 ] 2 CuCl 4 Crystals
Author(s) -
Kapustianik V.,
Korchak Yu.,
Polovinko I.,
Tchukvinskyi R.,
Czapla Z.,
Dacko S.
Publication year - 1998
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/(sici)1521-3951(199805)207:1<95::aid-pssb95>3.0.co;2-t
Subject(s) - phonon , condensed matter physics , phase (matter) , phase transition , materials science , crystallography , chemistry , physics , organic chemistry
Optical and spectral investigations confirmed the availability of phase transitions in [C 2 H 5 NH 3 ] 2 CuCl 4 at T 1 = 364 K, T h 2 = 356 K, T 3 = 232 K. It has been found that the empirical Urbach rule is fulfilled in all phases. It is shown, that in the high‐temperature phases skeletal vibrations of the C–N–C group interact with phonons, whereas in the low‐temperature phases internal vibrations of the metal–halogen complex occur. A ferroelastic domain structure was observed using the polarising microscope in the temperature region 232 to 364 K.