Hydrostatic piezoelectric properties of bismuth triborate crystals

In this report, the dielectric and hydrostatic piezoelectric properties of the monoclinic bismuth triborate crystals (BiB₃O₆, BIBO) were investigated at ambient temperature for potential hydrophone application. The pressure dependence of the hydrostatic charge and voltage coefficients dielectric properties (d_h and g_h), and hydrostatic figure of merit (FOM) d_h×g_h, were also studied. Results indicated that the BIBO crystals possess low dielectric loss being on the order of <;0.1% at room temperature. The hydrostatic piezoelectric coefficient d_h for BIBO crystals was experimentally obtained to be d_h =3.3 pC/N, while the piezoelectric hydrostatic coefficient g_h was obtained to be on the order of g_h =44.4×10^-3 V·m/N. Moreover, the FOM value was found to be on the order of 0.15 pm²/N, comparable to that of PMN-PT single crystals (0.12-0.78 pm²/N). In addition, the pressure coefficient a₁/d_h (1.0×10^-4 ppm/Pa) was calculated and found much lower than the reported PMN-PT single crystals (~0.001 ppm/Pa).