A single crystal high-pressure X-ray diffraction study of phase A was performed using a diamond anvil cell up to 11.2 GPa at ambient temperature. The chemical formula of this sample, determined by EPMA from an average of 8 data points, was Mg 66.9Si 1.99H 6.06O 14 Axial linear compressibilities of phase A wereβ a=2.92(2) andβ c= 2.17(3) (xlO -3/GPa). The isothermal bulk modulus, calculated using the Birch-Murnaghan equation of state, was K T0=105(4) GPa with a pressure derivative k'=3.9(8) and V 0=512.2(6) A 3. The bulk modulus correlates with the summation of the filling factor of the tetrahedral site and the octahedral site, as shown for the minerals on the forsterite-brucite join in the system MgO-Si0 2-H 20.
|Number of pages||20|
|Journal||Journal of Mineralogical and Petrological Sciences|
|Publication status||Published - 2003|
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