Maqola

Peculiarities of phase transitions in polytypes of monoclinic TlInS2

N. A. Borovoı̆Taras Shevchenko Kiev National University, pr. Akademika Glushkova 2, Kiev, 03680, UkraineYu. P. GololobovNational Transportation University, Kiev, UkraineG. L. IsaenkoNational Transportation University, Kiev, UkraineN. B. StepanishchevTaras Shevchenko Kiev National University, pr. Akademika Glushkova 2, Kiev, 03680, Ukraine

2009en

ABI

Annotatsiya

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.

Hali tarjima qilinmagan

Identifikatorlar

DOI: 10.1134/s0020168509010014

Iqtiboslar va manbalar

2 ta iqtibos0 ta foydalanilgan manba

Koʻrsatkichlar — AkademScholar