High-pressure X-ray diffraction studies on β- and γ-Mg2SiO4 |
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Authors: | Seishiro Mizukami Akihito Ohtani Naoto Kawai Eiji Ito |
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Institution: | Department of Material Physics, Faculty of Engineering Sciences, Osaka University, Toyonaka, Osaka Japan;Institute for Thermal Spring Research, Okayama University, Misasa, Tottori Japan |
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Abstract: | Pressure effects on the lattice parameters of β- and γ-Mg2SiO4 have been measured at room temperature and at pressures up to 100 kbar using a multi-anvil high-pressure X-ray diffraction apparatus. The volume changes (ΔV/V0) at 90 kbar are 5.4 · 10?2 and 4.2 · 10?2 for β- and γ-Mg2SiO4, respectively. Isothermal bulk moduli at zero pressure have been calculated from least-square fits of the data to straight lines. They turn out to be 1.66 ± 0.4 and 2.13 ± 0.1 Mbar for β- and γ-Mg2SiO4, respectively. The α → γ transition obeys Wang's linear Vφ?ρ relation but the α → β transition does not. |
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