Electro‐elastic properties of YCa₄O(BO₃)₃ piezoelectric crystals

YCa 4 O(BO 3 ) 3 (YCOB) crystal was reported to be a potential material for high temperature piezoelectric sensing applications. In this paper, the full matrix of electro‐elastic constants, including dielectric permittivities, elastic constants, and piezoelectric coefficients were determined. The relative dielectric permittivities were measured to be , , , and , respectively. The piezoelectric coefficients were determined to be d 11 = 1.7, d 12 = 3.9, d 13 = −4.2, d 15 = −1.1, d 24 = 4.4, d 26 = 7.9, d 31 = −0.77, d 32 = −2.5, d 33 = 1.4, and d 35 = −5.0 pC N −1 . In addition, piezoelectric cross‐talks of YCOB crystals were investigated, where ( XZlw )45°/35° and ( YXt )−30° crystal cuts were found to possess pure thickness shear mode, with relatively large effective piezoelectric coefficients, being on the order of d 15 = 8.8 and d 26 = 9.0 pC N −1 , respectively.