Stabilization of monoclinic distortion in [111] epitaxial PbTiO3 films

被引:4
作者
Zhu, Zhizhong [1 ]
Ma, Wenhui [1 ]
机构
[1] Shantou Univ, Dept Phys, Shantou 515063, Guangdong, Peoples R China
关键词
Monoclinic structure; Ferroelectric; Phase transition; Phenomenology; Epitaxial strain; Orientation; MORPHOTROPIC PHASE-BOUNDARY; POLARIZATION ROTATION; ELECTROMECHANICAL RESPONSE; DIAGRAMS;
D O I
10.1016/j.physleta.2021.127318
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Monoclinic distortion stabilized in a compressively strained [111] PbTiO3, for which the polarization vector is confined in a symmetry plane, is investigated using a phenomenological model. Rhombohedral to monoclinic transitions can be induced by stress normal to the film surface when flattening of energy surface reaches a critical barrier level. Two types of monoclinic states close in free energy exhibit opposite direction of induced polarization rotation. The impact of compressive stress on polarization, monoclinic shear strain, and volume change of unit cell is calculated and compared with experimental reports in the literature. Dielectric and piezoelectric anomalies are predicted in the stabilized monoclinic phase. (C) 2021 Elsevier B.V. All rights reserved.
引用
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页数:6
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