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
收藏
页码：237 / 240
页数：4
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