Electroelastic Features of Piezoelectric Bi₂ZnB₂O₇ Crystal

Abstract

A Bi2ZnB2O7 single crystal measuring 45 mm × 35 mm × 15 mm was grown by using the Kyropoulos method. The as-grown crystal showed distinct crystal facets (001), (010), and (110), among others, which were consistent with the ideal growth morphology predicted by the Bravais-Friedel and Donnay-Harker method. The electric, elastic, and piezoelectric properties of the Bi2ZnB2O7 single crystal were examined, using the impedance and pulse-echo methods for the first time. The independent piezoelectric coefficients d15, d24, d31, d32, and d33 were evaluated and found to be of the value of 1.4, −5.5, 2.5, −6.4, and 1.1 pC/N, respectively. The contributions of the crystal symmetry space group to the piezoelectric property were analyzed from the viewpoint of polyhedral distortion and net dipole moment. The temperature-dependent behaviors of the electroelastic properties were characterized in the temperature range from room temperature to 500 °C. Within this temperature range, the highest electromechanical coupling factor k32 (14.5%) and piezoelectric coefficient d33 (1.1 pC/N) exhibited temperature-independent behavior.