Evaluation of Material Constants and Temperature Properties in Lanthanum Calcium Oxoborate LaCa4O(BO3)3 Single Crystals

概要

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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., ${\varepsilon_{11}}^{T}$, ${\varepsilon_{22}}^{T}$, ${\varepsilon_{33}}^{T}$ and ${\varepsilon_{13}}^{T}$ determined at 10 kHz were 56.30, $-273.6$, 135.8 and $-258.4$ and $d_{11}$ and $d_{12}$ were $-408.3$ and 83.60 ppm/°C, respectively. Additionally, the thermal expansion coefficients e.g., $\alpha_{11}$, $\alpha_{22}$ and $\alpha_{33}$ determined on a single crystal cut along the $X$, $Y$ and $Z$ rectangular directions by the thermodilatometry measurement were $7.36\times 10^{-6}$, $8.17\times 10^{-6}$ and $11.4\times 10^{-6}$/°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.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-09-15