Abstract
The absolute structure of La3Ga5SiO14 piezoelectric crystals (a = 8.1746(6) A, c = 5.1022(4) A, space group P321, Z = 1) with the positive sense of rotation of the plane of polarization is refined using X-ray diffraction analysis (R = 1.37%, R w = 1.71%, 2413 unique reflections, max sinθ/λ = 1.15 A−1). The contributions from the anharmonicity of thermal vibrations of lanthanum atoms are calculated with the use of the components of the third-and fourth-rank tensors. It is demonstrated that these contributions can have a significant effect.
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