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Zeitschrift für Kristallographie - Crystalline Materials

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Huppertz, Hubert / Petrícek, Václav / Pöttgen, Rainer / Schmahl, Wolfgang / Tiekink, E. R. T. / Zou, Xiaodong

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Lattice parameters of La3Ga5SiO14 as a function of hydrostatic pressure

S. Werner / B. Maximov / H. Schulz / V. Molchanov / A. Vigdorchik / Yu. Pisarevskii

Citation Information: Zeitschrift für Kristallographie/International journal for structural, physical, and chemical aspects of crystalline materials. Volume 217, Issue 9/2002, Pages 460–463, ISSN (Print) 0044-2968, DOI: 10.1524/zkri.217.9.460.22886, September 2009

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Langasite (La3Ga5SiO14) crystallizes in the polar space group P321. Here we report the pressure dependence of the lattice parameters at high hydrostatic pressures up to 10.2 GPa. The results presented in terms of compressibility agree well with results from measurements of the elastic constants. According to a Birch-Murnaghan equation of state, the bulk modulus and its pressure derivative are 134.6(2) and 2.8(1) GPa, respectively. The compression of langasite crystals is anisotropic, the c/a-ratio appears to be a linear function of the pressure applied according to c/a = 0.62460(6) + 0.00055(1)* p/GPa. Altogether four single crystals have been investigated. Two of them showed a splitting of reflections (hhl). This splitting reaches a maximum at approximately 9 GPa and proved to be reversible.

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