Absolute structure of La3Ga5SiO14 langasite crystals
Absolute structure of La3Ga5SiO14 langasite crystals
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DOI：
10.1134/1.2049391
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发表时间：
2005-09-01
影响因子：
0.7
通讯作者：
Simonov, VI
中科院分区：
文献类型：
--
作者：
Maksimov, BA;Molchanov, VN;Simonov, VI
The absolute structure of La3Ga5SiO14 piezoelectric crystals (a = 8.1746(6) angstrom, c = 5.1022(4) angstrom, 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, maxsin theta/lambda = 1.15 angstrom(-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. (C) 2005 Pleiades Publishing, Inc.
