Evaluation of material constants in NdCa4O(BO3)3 piezoelectric single crystal

A neodymium calcium oxoborate NdCa4O (BO3)(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(11) and d(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(T)(11)/epsilon(0) = 9.9, epsilon(T)(22)/epsilon(0) = 15, epsilon(T)(33)/epsilon(0) = 10 and epsilon(T)(13)/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.