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Independent piezoelectric strain coefficients and in disordered LaGaTaAlO (LGTA) and ordered CaTaGaSiO (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 and for LGTA and CTGS crystals are = 6.455 × 10−12 C/N, = −5.117 × 10−12 C/N; = 3.330 × 10−12 C/N, = −15.835 × 10−12 C/N.


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