Characterization and validation of full matrix constants of MnO₂-doped 0.34BiScO₃-0.66PbTiO₃ piezoceramics for high-temperature transducer design

The demand for high-temperature piezoelectric devices based on BiScO₃-PbTiO₃ materials is increasing across aerospace, energy, and automotive sensor and transducer applications. In this study, the full matrix parameters of MnO₂-doped 0.34BiScO₃-0.66PbTiO₃ (Mn-BS-66PT) high-temperature piezoelectric ceramics were calculated based on the IEEE standard resonance method. The reliability of these parameters was validated through multiphysics simulations, which reproduced the resonant frequencies of the sample with less than 0.8% error compared to experimental measurement. The simulation results demonstrate that the Mn-BS-66PT based transducer exhibits superior performance compared to the Mn-BS-64PT and PZT-5A based transducer, exhibiting 37% and 32% higher surface displacement amplitudes, and 11.3 dB and 10.3 dB greater transmitting voltage response, respectively. Laser vibrometer experiments further confirm its superior vibration velocity, with a 48% improvement over Mn-BS-64PT. High-temperature admittance tests reveal that the Mn-BS-66PT transducer maintains excellent performance up to 250 °C, making it an ideal material for high-performance, high-temperature transducers.