High-pressure X-ray diffraction studies on β- and γ-Mg2SiO4

Details High-pressure X-ray diffraction studies on β- and γ-Mg2SiO4 High-pressure X-ray diffraction studies on β- and γ-Mg2SiO4

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pepi...10..177m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 10, Issue 2, p. 177-182.

Physics

10

Scientific paper

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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