Temperature-Dependent Behaviours Of Electro-Elastic Constants For The Bi2znb2o7 Piezoelectric Crystal

The bismuth-based borate Bi2ZnB2O7 (BZBO) crystal is a multi-functional material with potential non-linear optical and piezoelectric properties. In this study, the temperature-dependent behaviours of the dielectric permittivities, resonant frequencies, elastic compliances and piezoelectric coefficients for Bi2ZnB2O7 crystals were studied over the temperature range of 150-150 degrees C. The Bi2ZnB2O7 crystals were found to present minimal dielectric permittivity variations (<10%) and low dielectric losses (<1%). The temperature coefficients of the elastic compliances were found to be in the order of 0.98 x 10(-4) -1.17 x 10(-4)/degrees C, showing good temperature stability. The resonant frequencies decreased with increasing temperature, and the variations were all in 2%. The temperature dependence of the piezoelectric coefficients for the Bi2ZnB2O7 crystals was studied, and the piezoelectric coefficients showed different trends as a function of temperature, whereby the first order of TCPs were found to be in the order of -5.10 x 10(-4) -3.88 x 10(-4) /degrees C. In addition, the maximum piezoelectric rotated crystal cuts for the Bi2ZnB2O7 crystals were (YXt)/59 degrees and (YXt)/146 degrees for longitudinal and thickness shear vibration modes, respectively.