Peculiarities of phase transitions in polytypes of monoclinic TlInS2

被引：4
作者：
Borovoi, N. A. [1 ]
Gololobov, Yu. P. [2 ]
Isaenko, G. L. [2 ]
Stepanishchev, N. B. [1 ]
机构：
[1] Taras Shevchenko Kiev Natl Univ, UA-03680 Kiev, Ukraine
[2] Natl Transportat Univ, Kiev, Ukraine
来源：
INORGANIC MATERIALS | 2009年 / 45卷 / 01期
关键词：
LAYERED SEMICONDUCTOR TLINS2; INCOMMENSURATE PHASE; X-RAY; CRYSTAL; TEMPERATURE;
D O I：
10.1134/S0020168509010014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The existence of two polytypes at room temperatures, C-TlInS2 and 2C-TlInS2, with different monoclinic cell parameters, c and 2c, 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 2C-TlInS2, but a global temperature hysteresis characteristic of crystals with an incommensurately modulated structure has been detected at T = 180-230 K.
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页码：1 / 6
页数：6
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