Hydrostatic piezoelectric properties of bismuth triborate crystals

In this report, the dielectric and hydrostatic piezoelectric properties of the monoclinic bismuth triborate crystals (BiB
₃
O
₆
, 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 pm
²
/N, comparable to that of PMN-PT single crystals (0.12-0.78 pm
²
/N). In addition, the pressure coefficient a
₁
/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).