Theoretical Study of Antiferrodistortive Phase Transition in Strontium Titanate

被引：3

作者：

Cai, Yu-ping ^{[1
]}

Han, Dai-zhao ^{[1
]}

Ning, Ru-yun ^{[1
]}

机构：

[1] Ordnance Engn Coll, Dept Basic Courses, Shijiazhuang 050003, Peoples R China

来源：

CHINESE JOURNAL OF CHEMICAL PHYSICS | 2010年 / 23卷 / 02期

关键词：

Spontaneous polarization; Dielectric permittivity; Free energy; Antiferrodistortive phase transition; LANDAU THEORY; SRTIO3; TEMPERATURE; ORDER; PARAMETERS; SATURATION;

D O I：

10.1088/1674-0068/23/02/237-240

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

At 105 K, strontium titanate is known to undergo an antiferrodistortive transition transforming from cubic to tetragonal structure as a result of the rotation of the oxygen octahedral around a cubic axe. Based on the Curie principle, the order parameter is determined to be a third-order complete symmetry polarization tensor. To take into account of quantum effects, the dielectric permittivity is measured from Landau free energy, and the Curie Weiss-type behavior is analyzed. From crystallization chemistry viewpoint, the dielectric behavior at low temperature is connected to small radius of Sr2+, which is much easier to move around the oxygen octahedral than Ba2+ in BaTiO3 or Pb2+ in PbTiO3.

引用

页码：237 / 240

页数：4

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