Dielectric susceptibility behaviour in the incommensurate phase of TlInS2

• Published in: Physica. B, Condensed matter Vol. 334; no. 1-2; pp. 13 - 20
• Main Authors: MIKAILOV, F. A, BASARAN, E, MAMMADOV, T. G, SEYIDOV, M. Yu, SENTÜRK, E
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 01.06.2003
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Ferroelectricity and antiferroelectricity; Incommensaturate crystals; Incommensurate crystals; Permittivity (dielectric function); Phase transitions and curie point; Physics; Semi-periodic solids; Structure of solids and liquids; crystallography; Temperature dependence; Inorganic compounds; Semiconductor materials; Incommensurate phases; 78.20.C; Ternary compounds; Theoretical study; 77.80.B; Coexistence; Phase transitions; Dielectric response; Dielectric susceptibility; Dual phase structure; Ferroelectric materials; Sublattices; Thallium sulfides; 61.44.F Ferroelectrics; Permittivity; Indium sulfides
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/S0921-4526(02)02682-0

Peculiarities of the temperature behaviour of the dielectric susceptibility of TlInS2 in the temperature interval of incommensurate (IC) phase have been theoretically investigated on the basis of recently suggested two-sublattice model of the phase transitions in TlInS2, which is based on the hypothesis about the coexistence of improper and proper ferroelectricity and also the presence of type I and type II in commensurations in the same compound. The temperature dependence of the dielectric constant of TlInS2 in the IC phase was calculated. An agreement between theoretical and experimental results has been obtained.