A systematic study of the optimized orientation and temperature dependence of shear-mode piezoelectric properties for ternary Pb͑In 1/2 Nb 1/2 ͒O 3 -Pb͑Mg 1/3 Nb 2/3 ͒O 3 -PbTiO 3 ͑PIN-PMN-PT or PIMNT͒ piezocrystals was carried out. It was found that ͓111͔-poled samples presented the best shear piezoelectric properties when driving along ͓110͔ ͑the thickness direction͒. The electromechanical coupling coefficient k 15 and piezoelectric coefficient d 15 and g 15 were found to be 96.4%, 5966 pC/N, and 0.047 Vm/N, respectively, for optimum-cut samples with platinum ͑Pt͒ electrode. Besides, the maximum service temperature for shear mode is around 105°C, which is much higher than PMNT single crystals.
In this paper, PIMNT/epoxy 1-3 composites with different volume fractions were prepared by the dice-and-fill method for application in ultrasonic transducers. The theoretical and experimental properties at different volume fractions and the temperature stability of the electromechanical property were investigated. The highest electromechanical coupling factor k(t) was obtained as 0.833 with the volume fraction of 0.58 and k(t) changed little below the Curie temperature of the single crystal. Afterward, an angle-beam transverse wave ultrasonic transducer using the fabricated composite was designed and manufactured based on the simulation of the KLM model and commercial software. The assembled prototype transducer showed large improvement in two-way insertion loss, relative bandwidth at -6 dB, surplus sensitivity, and axial resolution, which were -24.3 dB, 107%, 85 dB, and 28 dB, respectively, compared with a commercial PZT-based composite transducer.
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