The dielectric, piezoelectric, and acoustic properties of PMN-0.32PT (Pb(Mg1/3Nb2/3) O3-PbTiO3) single crystals were investigated as a function of sample thickness ranging from 120 to 30 μm in order to enlighten the origin of property degradation of crystals for high frequency ultrasound applications. Electromechanical coupling factor (kt ), clamped and free dielectric constants decreased but sound velocity increased with decreasing crystal thickness. Particularly, repoling of the PMN-PT crystals would bring about a noteworthy enhancement in electromechanical and dielectric properties, which urges the importance of PMN-PT as a promising piezoelectric material for high frequency ultrasound transducers.

中文翻译：

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用于高频医学成像应用的高介电常数 PMN-0.32PT 单晶的厚度相关特性

研究了 PMN-0.32PT (Pb(Mg1/3Nb2/3) O3-PbTiO3) 单晶的介电、压电和声学特性与样品厚度范围从 120 到 30 μm 的关系，以启发性质的起源高频超声应用中晶体的降解。机电耦合因子 (kt )、钳位和自由介电常数降低，但声速随着晶体厚度的减小而增加。特别是，PMN-PT 晶体的重新极化将带来机电和介电性能的显着增强，这表明 PMN-PT 作为一种有前途的高频超声换能器压电材料的重要性。