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- Title
Peculiarities of phase transitions in polytypes of monoclinic TlInS<sub>2</sub>.
- Authors
Borovoi, N.; Gololobov, Yu.; Isaenko, G.; Stepanishchev, N.
- Abstract
The existence of two polytypes at room temperatures, C-TlInS2 and 2 C-TlInS2, with different monoclinic cell parameters, c and 2 c, has been revealed. Significant differences in crystal lattice dynamics of these polytypes have been found. In particular, two phase transitions (PTs) have been detected for the polytype C-TlInS2 as the temperature varies: a second-order PT from paraphase to incommensurate phase at T i = 215 K and a first-order ferroelectric PT accompanied by a quadrupling of the parameter c at T c = 197 K. No PT accompanied by an increase in unit cell parameter c has been found in the polytype 2 C-TlInS2, but a global temperature hysteresis characteristic of crystals with an incommensurately modulated structure has been detected at T = 180–230 K.
- Subjects
PHASE transitions; THALLIUM alloys; INDIUM alloys; FERROELECTRIC crystals; HYSTERESIS
- Publication
Inorganic Materials, 2009, Vol 45, Issue 1, p1
- ISSN
0020-1685
- Publication type
Article
- DOI
10.1134/S0020168509010014