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Electrical conductivity of layered CuInP 2 (S x Se 1 − x ) 6 crystals
Author(s) -
Macutkevic Jan,
Banys Juras,
Vysochanskii Yulian
Publication year - 2015
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.201451738
Subject(s) - conductivity , electrical resistivity and conductivity , materials science , anomaly (physics) , dielectric , phase (matter) , selenium , analytical chemistry (journal) , condensed matter physics , mineralogy , chemistry , physics , metallurgy , optoelectronics , organic chemistry , quantum mechanics , chromatography
Investigations of the electrical conductivity of mixed CuInP 2 (S x Se 1– x ) 6 crystals were carried out in the frequency range of 20–1 MHz. Anomalies in dc conductivity were observed close to the ferroelectric phase‐transition temperature. However, these anomalies are different in selenium‐ and sulfur‐rich compounds. While in the selenium‐rich crystals group the anomaly of conductivity is sharp, in the sulfur‐rich crystals group it is less expressed. These results indicate that the copper ions contribution to the total conductivity is not vanishing down to the lowest temperatures in sulfur‐rich crystals. Moreover, in paraelectric phase the dc conductivity activation energy correlate with the pre‐exponential factor according to the Meyer–Neldel law. No conductivity anomaly was observed in mixed CuInP 2 (S x Se 1– x ) 6 crystals with the dipolar glass or relaxor behavior.