Crystal structure and order parameters in the phase transition of antiferroelectric PbZrO3

被引:55
作者
Fujishita, H [1 ]
Ishikawa, Y
Tanaka, S
Ogawaguchi, A
Katano, S
机构
[1] Kanazawa Univ, Dept Phys, Kanazawa, Ishikawa 9201192, Japan
[2] Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan
关键词
antiferroelectrics; PbZrO3; structure; lattice distortion; order parameter; Landau theory;
D O I
10.1143/JPSJ.72.1426
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
X-ray and neutron diffraction and dielectric measurements were performed for the antiferroelectric phase of PbZrO3. The antiferroelectric Sigma(3)(TO) and the R-25 superlattice-reflection intensities, and the pseudo-tetragonal lattice distortion of the perovskite sublattice showed the same temperature dependence below room temperature, showing a saturation below about 60 K. Above room temperature, however, they showed rather different temperature dependences. These temperature dependences can be well described by the free energy based on a group theoretical method, which includes a quantum effect. The atomic shifts do not necessarily conform to a simple concept of order parameter in soft mode condensation. However the antiferroelectric phase transition can be understood by the phenomenological theory for coupled order parameters if applied over the whole temperature region.
引用
收藏
页码:1426 / 1435
页数:10
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