Abstract
Lanthanum calcium oxoborate LaCa4O(BO3)3 (LaCOB) single crystals were successfully grown by the Czochralski technique. It was found that LaCOB crystals belong to the monoclinic system (point group m) and the total number of independent material constants that should be determined is 27. Twenty-four of the 27 material constants at room temperature were determined by the resonance-antiresonance method. The normalized first-order temperature coefficients of some constants e.g., ε11T, ε22T, ε33T and ε13T determined at 10 kHz were 56.30, -273.6, 135.8 and -258.4 and d11 and d12 were -408.3 and 83.60 ppm/°C, respectively. Additionally, the thermal expansion coefficients e.g., α11, α22 and α33 determined on a single crystal cut along the X, Y and Z rectangular directions by the thermodilatometry measurement were 7.36×10-6, 8.17×10-6 and 11.4×10-6/°C, respectively. As a result of the evaluation, most of the material constants and temperature properties necessary for investigating the properties of piezoelectric devices typified by SAW were obtained.
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