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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 hydrostatic pressure dependence of the phase transitions and dielectric properties for a potassium niobate crystal
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The hydrostatic pressure dependence of the phase transitions and dielectric properties for a potassium niobate crystal

机译：铌酸钾晶体的相变和介电性能的静压压力依赖性

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摘要

The phase transitions, spontaneous polarizations, and dielectric properties of a potassium niobate (KNbO3) ferroelectric crystal were investigated under hydrostatic pressure from 0 to 21.3 GPa using the Landau-Ginsburg-Devonshire phenomenological theory. It was shown that the phase transition temperatures of cubic to tetragonal, tetragonal to orthorhombic, and orthorhombic to rhombohedric decreased as the hydrostatic pressure was increased and the derivative of the phase transition temperatures with respect to hydrostatic pressure could be estimated to be -33.1 degrees C/GPa. The spontaneous polarizations decreased nonlinearly with increasing hydrostatic pressure which could be attributed to the hydrostatic pressure-induced decrease of the interionic distance. The dielectric susceptibility epsilon(33) increased by about 85% and the dielectric susceptibility epsilon(11) decreased by about 50% when hydrostatic pressure increased from 0 to 4 GPa at 260 degrees C. It provides a new effective way to improve the pressure sensitivity in acoustic transducer and the energy storage performance of capacitor. The changes of dielectric susceptibilities induced by hydrostatic pressure had been explained by the flattening or steepness of Gibbs free energy profile. As the properties of the ceramics are related to those of the single crystal, results in this paper can be used to explore the general rule of performance change induced by pressure for lead free KNbO3-based ceramics. (C) 2018 Elsevier B.V. All rights reserved.
机译：使用Landau-Ginsburg-Devonshire现象理论，在静水压力下研究了铌酸钾（KNO3）铁电晶体的相转变，自发偏振和介电性质。结果表明，立方相转变温度为四方晶，正方晶到斜方晶系，斜方晶系和对rhombohedric随着所述流体静压力增加和相转变温度相对于静水压力的导数可以被估计为-33.1摄氏度/ GPA。自发偏振的非线性降低，随着静水压力的增加，该静压压力归因于静级压力诱导的区域距离降低。当静压压力在260℃下静压压力从0〜4GPa增加，介电易感性ε（33）增加约85％，介电敏感性ε（11）降低约50％。它提供了提高压力敏感性的新有效方法在声学传感器和电容器的能量存储性能中。通过Gibbs自由能剖面的扁平化或陡度解释了静压压力诱导的介电学敏感性的变化。随着陶瓷的性质与单晶的性质有关，本文的结果可用于探讨因基于铅KNO3陶瓷的压力诱导的性能变化的一般规则。 （c）2018年elestvier b.v.保留所有权利。

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