Dielectric and electrical properties of SbSI and SbSeI single crystals in the region of antiferroelectric phase transition

Autor:	Raimundas Sereika, Algirdas Audzijonis, R. Žaltauskas, L. Žigas
Rok vydání:	2015
Předmět:	Phase transition Materials science Condensed matter physics Band gap General Chemistry Soft modes Dielectric Condensed Matter Physics Ferroelectricity Condensed Matter::Materials Science Electrical resistivity and conductivity Electric field Phase (matter) General Materials Science
Zdroj:	Journal of Physics and Chemistry of Solids. 83:117-120
ISSN:	0022-3697
DOI:	10.1016/j.jpcs.2015.04.003
Popis:	Experimental results have shown that the capacitance (dielectric permittivity) and electrical conductivity of SbSI and SbSeI crystals along the c(z)-axis change significantly in the region of the antiferroelectric phase transition when DC voltage is applied. An electric field changes the form of B1u (A1) soft mode potential in sites of Sb atoms, which turns the antiferroelectric phase into an induced ferroelectric phase. Degenerate energy levels then split into non-degenerate levels due to electron–phonon interaction (pseudo Jahn–Teller effect), while a narrowed band gap simultaneously creates strong and abrupt changes in C(T) and σ ( T ) .
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::98d60c16991f6806b98dc5c075f58072 https://doi.org/10.1016/j.jpcs.2015.04.003 Zobrazit plný text záznamu Full Text from ScienceDirect