Evaluation of material constants in NdCa sub(4)O(BO sub(3)) sub(3) piezoelectric single crystal

A neodymium calcium oxoborate NdCa sub(4)O(BO sub(3)) sub(3) piezoelectric single crystal that belongs to the monoclinic system with point group m was grown by the Czochralski technique. A practical evaluation method was developed to determine the 27 independent material constants for acoustic wave device applications. A longitudinal effect face-shear vibration was analyzed and used in the resonance-antiresonance measurement. This method avoided measuring d sub(11) and d sub(33) directly by use of X-bar and Z-bar, in which leak of electric field would cause large errors because of the very small dielectric constants. At room temperature, dielectric constants were epsilon 11 T mathord / vphantom epsilon 11 T epsilon 0 kern - nulldelimiterspace epsilon 0 = 9.9 , epsilon 22 T mathord / vphantom epsilon 22 T epsilon 0 kern - nulldelimiterspace epsilon 0 = 15 , epsilon 33 T mathord / vphantom epsilon 33 T epsilon 0 kern - nulldelimiterspace epsilon 0 = 10 and epsilon 13 T mathord / vphantom epsilon 13 T epsilon 0 kern - nulldelimiterspace epsilon 0 = - 0.8 , respectively. All the independent dielectric and elastic constants were determined in this work. The simulation of surface acoustic wave velocity showed a good agreement with the measured value.