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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >The influence of external stress/strain on the phase transitions and dielectric properties of potassium niobate crystal
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The influence of external stress/strain on the phase transitions and dielectric properties of potassium niobate crystal

机译：外部应力/应变对铌酸钾晶体相转变和介电性能的影响

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摘要

We investigated the effects of one-dimensional shock wave compression on the structural, dielectric, and ferroelectric properties of a potassium niobate ferroelectric crystal using Landau-Ginsburg-Devonshire phenomenological theory. Our results show that the cubic to tetragonal and tetragonal to orthorhombic phase transition temperatures increase with increasing shock compression and the derivative of the phase transition temperatures with respect to stain induced by shock compression was estimated to be 21.9 degrees C/10(-3). Additionally, the orthorhombic to rhombohedral phase transition temperature decreased with increasing shock compression and the derivative of the phase transition temperatures with respect to stain induced by shock compression was estimated to be -144.3 degrees C/10(-3). This result represents a 15.3% increase in the remnant polarization of the tetragonal KNbO3 crystal when the stain induced by shock compression increased from 0 to 4 x 10(-3) at 400 degrees C. The dielectric susceptibilities epsilon(33) and epsilon(22 )were calculated to decrease by approximately 20% and 40%, respectively, when the stain induced by shock compression increased from 0 to 1.6 x 10(-3) at 350 degrees C. The increase in the remnant polarization and the decrease in the dielectric properties induced by shock compression provide an effective way to improve the power output capacity of a ferroelectric-pulsed power supply. (C) 2018 Elsevier B.V. All rights reserved.
机译：我们研究了使用Landau-Ginsburg-Devonshire现象理论的铌酸盐铁电晶体的结构，电介质和铁电性能的效果。我们的结果表明，该立方为四方和四方到斜方晶相转变温度随冲击压缩和衍生物的相变温度的相对于染色通过冲击压缩诱导增加估计为21.9℃/ 10（-3）。另外，随着rhombohedral相转变温度的逆转录，随着冲击压缩的增加而降低，相对于通过冲击压缩诱导的污渍的相变温度的衍生物估计为-144.3℃/ 10（-3）。当抗冲击压缩诱导的污渍从400℃的污渍增加时，TETROGAL KNBO3晶体的残余偏振增加15.3％。εε（33）和epsilon的介电敏感性增加（22当通过冲击压缩诱导的污渍在350℃下诱导的污渍增加时，分别计算约20％和40％。在350℃下增加0至1.6×10（-3）。延长偏振的增加和电介质的降低受冲击压缩引起的性质提供了提高铁电脉冲电源的功率输出能力的有效方法。 （c）2018年elestvier b.v.保留所有权利。

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