Spurious-mode vibrations caused by alternating current poling and their solution process for Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3) single crystals  

作　　者：Yiqin Sun Tomoaki Karaki Tadashi Fujii Yohachi John Yamashita 

机构地区：[1]Department of Intelligent Robotics,Toyama Prefectural University,Imizu,9390398,Toyama,Japan [2]Mechanical&Aerospace Engineering,North Carolina State University,Raleigh,NC,27695-7910,USA

出　　处：《Journal of Materiomics》2022年第1期96-103,共8页无机材料学学报（英文）

摘　　要：The effects of alternating current poling(ACP)at 80℃on electrical properties of[001]-oriented 0.72 Pb(Mg_(1/3)Nb_(2/3))O_(3)-0.28PbTiO_(3)(PMN-28PT)single crystals(SCs)have been investigated.The square-wave ACP SCs poled at high voltage(HV,5 kV_(rms)/cm)occasionally showed large fluctuations and low opposite values of piezoelectric coefficient(d_(33)=±1370 pC/N)in one plate.This revealed spuriousmode vibrations(SMV)of impedance spectrum.However,after depolarizing and repolarizing the sample with a sine-wave ACP at low voltage(LV,3.5 kV_(rms)/cm),the d_(33) 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 d_(33) and improve other properties of PMN-PT ACP SC ultrasonic transducers without any SMV for high-frequency medical imaging equipment.

关 键 词：Alternating current poling Ferroelectric single crystal Ultrasonic transducer Spurious mode vibration Piezoelectric property 

分 类 号：TQ17[化学工程—硅酸盐工业]