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Disordering effect on optical absorption processes in CuInP 2 S 6 layered ferrielectrics
Author(s) -
Studenyak I. P.,
Mitrovcij V. V.,
Kovacs Gy. S.,
Gurzan M. I.,
Mykajlo O. A.,
Vysochanskii Yu. M.,
Cajipe V. B.
Publication year - 2003
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.200301513
Subject(s) - absorption edge , absorption (acoustics) , dielectric , enhanced data rates for gsm evolution , materials science , phase (matter) , condensed matter physics , range (aeronautics) , band gap , phase transition , atmospheric temperature range , chemistry , optoelectronics , thermodynamics , physics , composite material , telecommunications , organic chemistry , computer science
The optical absorption edge of CuInP 2 S 6 crystals is studied between 77 and 573 K. The nature of optical transitions, resulting in absorption edge formation in ferrielectric and paraelectric phases, is elucidated. The temperature variation of the energy gap in the ferrielectric phase transition range and the temperature behavior of the Urbach absorption edge in the paraelectric phase are studied. The effect of temperature and structural disordering on the absorption edge energy position and shape is analyzed.