Defects of Non-Stoichiometry and Dynamic Stability of SnTe Crystal Lattice |
| E.I. Rogacheva, N.A. Sinelnik, O.N. Nashchekina Polytechnical Institute, 21, Frunze St., Kharkov 310002, Ukraine V.P. Popov and T.A. Lobkovskaya Kharkov State University, 4, Svoboda Sq., Kharkov 310077, Ukraine |
| Full Text PDF |
| The temperature dependencies of coefficient of linear expansion α in the range of 4.2-300 K were obtained for SnTe samples with various degrees of deviation from stoichiometry. For the sample of stoichiometric composition in the α vs. temperature curves the anomalies connected with ferroelectric phase transition were detected. It was found that within cubic phase existence region α isotherms have a minimum at 50.4 at.% Te. Maximum dynamic stability at indicated composition is believed to be associated with the formation of vacancy superstructure. |
| DOI: 10.12693/APhysPolA.84.733 PACS numbers: 61.70.Bv, 65.70.+y |