Abstract
Abstract : The elastic, piezoelectric and dielectric constants of berlinite (alpha-A1PO4) are presented. The berlinite samples were obtained from the Allied Corporation and grown by one of the authors (BHTC). The elastic constants were measured using the pulse echo overlap method. The piezoelectric constants were obtained from the measurement of the resonance and antiresonance frequencies of stiffened shear modes for several Y and plus or minus 45 degrees rotated Y-cut plates. The relative dielectric constants were measured using capacitive techniques from the X and Z-cut plates at 2 MHz. The measured elastic constants are in reasonable agreement with the results of Chang and Barsch. The results for the piezoelectric constants, e11 and e14 were found to be smaller in magnitude than the values reported by Chang and Barsch. The measured values of the relative dielectric constants, epsilon 11 and epsilon 33, were approximately equal to 4.8.
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