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Piezoelectric strain coefficients in La3
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Independent piezoelectric strain coefficients d 11 and d 14 in disordered La3Ga5.3Ta0.5Al0.2O14 (LGTA) and ordered Ca3TaGa3Si2O14 (CTGS) crystals of the langasite family were measured by high-resolution X-ray diffraction (HRXRD) under external electric field application which causes changes in the interplanar spacing because of the reverse piezoelectric effect. The experiment showed that the piezoelectric strain coefficients can be precisely determined by measuring changes in the interplanar spacing using the optical scheme of a triple-axis X-ray diffractometer. The measured independent piezoelectric strain coefficients d 11 and d 14 for LGTA and CTGS crystals are d 11(LGTA) = 6.455 × 10−12 C/N, d 14(LGTA) = −5.117 × 10−12 C/N; d 11(CTGS) = 3.330 × 10−12 C/N, d 14(CTGS) = −15.835 × 10−12 C/N.
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