Temperature investigations of the ferroelectric crystals Sn2P2S6 and Sn2P2Se6 by means of 119Sn Mossbauer spectroscopy

被引：8

作者：

Baltrunas, D

Grabar, AA

Mazeika, K

Vysochanskii, YM

机构：

[1] Inst Phys, LT-2600 Vilnius, Lithuania

[2] Uzhgorod State Univ, Inst Solid State Phys & Chem, UA-294000 Uzhgorod, Ukraine

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1999年 / 11卷 / 14期

关键词：

D O I：

10.1088/0953-8984/11/14/014

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Mossbauer spectra of Sn2P2S6 and Sn2P2Se6 proper uniaxial ferroelectrics were investigated over a wide temperature region including phase transition points with the aim of studying the dynamics of ferroactive tin ions used as a Mossbauer isotope (Sn-119). The characteristics of the gamma-resonance lines (isomer shift, effect probability, etc) and the parameters calculated from the measured spectra in the Debye approximation (mean square displacement, Debye-Waller factor, Debye temperature, etc) were analysed in comparison with the available structural and thermodynamical data. The data obtained support the assumption of a two-well local potential of the tin atoms in addition to the displacement of their time-averaged position below the phase transition points. It was concluded that displacement and ordering occur in the same Sn sublattice, and that the variation in long-range forces leads to lattice instability.

引用

页码：2983 / 2992

页数：10

共 28 条

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