Structure and crystal chemistry of phase G, a new hydrous magnesium silicate synthesized at 22 GPa and 1050°C

Details Structure and crystal chemistry of phase G, a new hydrous magnesium silicate synthesized at 22 GPa and 1050°C Structure and crystal chemistry of phase G, a new hydrous magnesium silicate synthesized at 22 GPa and 1050°C

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1051k&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 9, p. 1051-1054

Physics

15

Mineralogy And Petrology: Crystal Chemistry, Mineralogy And Petrology: Descriptive Mineralogy, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction

Scientific paper

A single crystal of phase G, Mg1.24Si1.76H2.48O6 synthesized at conditions of 1050°C and 22 GPa, using a multi-anvil apparatus was studied at the Photon Factory BL-10A beamline at the National Laboratory for High Energy Physics, Tukuba, Japan. With a (111) Si double-crystal monochromator and a single crystal measuring 47×35×12μm, intensities of 95 independent reflections were collected with sinθ/λ<0.72Å-1 and Io>1.5σ Io at a wave length of 0.6990 Å. The unit cell parameters obtained through the refinement of 23 reflections are: Trigonal, a=4.790(3)Å, c=4.344(3)Å, V=86.3(2)Å3. The result of structure analysis in space group P31m (No. 162) indicates that the structure of phase G has close structural similarity to that of stishovite, SiO2. The calculated density of phase G is 3.43g/cm3, which is larger than any other known dense hydrous magnesium silicate, suggesting that phase G might be stable even under lower mantle conditions.

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