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Published on: August 5, 2020
Micromachining of High Quality PMN-31%PT Single Crystals for High-Frequency (>20 MHz) Ultrasonic Array Transducer
Zhihong Lei1, Yan Chen1, Guisheng Xu2
1State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, China.
Abstract:
A decrease of piezoelectric properties in the fabrication of ultra-small Pb(Mg1/3Nb2/3)-x%PbTiO3 (PMN-x%PT) for high-frequency (>20 MHz) ultrasonic array transducers remains an urgent problem. Here, PMN-31%PT with micron-sized kerfs and high piezoelectric performance was micromachined using a 355 nm laser. We studied the kerf profile as a function of laser parameters, revealing that micron-sized kerfs with designated profiles and fewer micro-cracks can be obtained by optimizing the laser parameters. The domain morphology of micromachined PMN-31%PT was thoroughly analyzed to validate the superior piezoelectric performance maintained near the kerfs. A high piezoresponse of the samples after micromachining was also successfully demonstrated by determining the effective piezoelectric coefficient (d~1200 pm/V). Our results are promising for fabricating superior PMN-31%PT and other piezoelectric high-frequency (>20 MHz) ultrasonic array transducers.
