Physics
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1831y&link_type=abstract
Geophysical Research Letters, Volume 24, Issue 14, p. 1831-1834
Physics
27
Geochemistry: Composition Of The Mantle, Mineralogy And Petrology: Crystal Chemistry, Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction
Scientific paper
Isothermal compressibility of hydrous wadsleyite has been measured for the first time by using in-situ X-ray diffraction in a diamond anvil apparatus at pressures up to 8.5 GPa of a sample which was synthesized at 15.5 GPa and 1300°C under hydrous conditions. The hydrous wadsleyite sample included 2.5+/-0.3wt% of H2O as determined by secondary ion mass spectroscopy. The cell parameters of the present hydrous wadsleyite are fit to the orthorhombic symmetry within error. The linear compressibilities along a- and c-axes of the present hydrous wadsleyite are very similar to those of the anhydrous wadsleyite, but the liner compressibility along the b-axis of the present hydrous wadsleyite is ~15% larger than that of the anhydrous wadsleyite. Consequently, the calculated bulk modulus (K0) is 155+/-2GPa with the pressure derivative (K0') fixed to 4.3. This value is 5~11% smaller than that of anhydrous wadsleyite. On the basis of the above result, the seismic discontinuity around 400 km is discussed.
Inoue Toru
Yusa Hitoshi
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