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Spurious-mode vibrations caused by alternating current poling and their solution process for Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals
Journal of Materiomics ( IF 9.4 ) Pub Date : 2021-05-25 , DOI: 10.1016/j.jmat.2021.05.002
Yiqin Sun , Tomoaki Karaki , Tadashi Fujii , Yohachi John Yamashita

The effects of alternating current poling (ACP) at 80 °C on electrical properties of [001]-oriented 0.72 Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 (PMN-28PT) single crystals (SCs) have been investigated. The square-wave ACP SCs poled at high voltage (HV, 5 kVrms/cm) occasionally showed large fluctuations and low opposite values of piezoelectric coefficient (d33 = ± 1370 pC/N) in one plate. This revealed spurious-mode vibrations (SMV) of impedance spectrum. However, after depolarizing and repolarizing the sample with a sine-wave ACP at low voltage (LV, 3.5 kVrms/cm), the d33 enhanced to be 1720 pC/N (+26%) and did not exhibit large fluctuation or opposite values in one plate any more. The impedance spectrum became clean and the abnormal SMV disappeared. We proposed four possible mechanisms of the SMV, and speculate that the main cause maybe by macro-scale sub-domain structure and/or phase change in the main domain structure and/or phase in the SC plate due to the specific poling conditions not eternal mechanical damage of PMN-PT SCs. This study will be useful to realize a high d33 and improve other properties of PMN-PT ACP SC ultrasonic transducers without any SMV for high-frequency medical imaging equipment.



中文翻译:

Pb(Mg1/3Nb2/3)O3-PbTiO3单晶交流极化引起的杂散振动及其溶解过程

交流电极化 (ACP) 在 80 °C 对 [001] 取向 0.72 Pb(Mg 1/3 Nb 2/3 )O 3 -0.28PbTiO 3 (PMN-28PT) 单晶 (SCs) 电性能的影响已被调查。在高电压(HV,5 kV rms /cm)下极化的方波 ACP SC 在一块板上偶尔会显示出较大的波动和较低的压电系数(d 33 = ± 1370 pC/N)的相反值。这揭示了阻抗谱的寄生模式振动 (SMV)。然而,在低电压(LV,3.5 kV rms /cm)下用正弦波 ACP 对样品进行去极化和复极化后,d 33增强到 1720 pC/N (+26%) 并且在一块板中不再表现出大的波动或相反的值。阻抗谱变得清晰,异常的 SMV 消失。我们提出了SMV的四种可能机制,并推测主要原因可能是由于特定的极化条件不是永恒的,宏观子域结构和/或主域结构和/或SC板中的相位变化PMN-PT SCs 的机械损伤。这项研究将有助于实现高d 33并改善 PMN-PT ACP SC 超声换能器的其他特性,而无需任何用于高频医学成像设备的 SMV。

更新日期:2021-05-25
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