Bixbyite (Mn,Fe)Pressure-induced phase transition was confirmed at about 21 GPa with a large hysteresis. The transition is reversible and non-quenchable. Powder indexing of the high-pressure phase was carried out using diffraction pattern taken at 35.06 GPa. It has a monoclinic symmetry and is not a corundum, Rh
A new diamond anvil cell was devised for the single-crystal structure analyses under high pressure. The cell is characterized by large single-crystal diamond plates, which are used for the windows and fixed on the table planes of diamond anvils. The diamond plate windows have great advantages for single-crystal diffractometry, such as low x-ray absorption, much higher pressures up to 50 GPa, no powder rings from the window, and wide 2θ-angle (2θ<70°). Great progress of the structure analyses could be made by the combination with synchrotron radiation (SR). The short wavelength of λ=0.407 72 Å (E=30.388 keV) of SR source with 8 GeV 100 mA at SPring-8 was used for the diffraction intensity measurement of SiO2 stishovite (rutile type). These advantages could measure the intensities of much higher order reflections and the precise electron density distribution as a function of pressure was discussed.
Single-crystal structure analysis of SiO 2 stishovite, (rutile type, P4 2 /mnm z = 2) was carried out using the newly devised diamond anvil cell. The electrondensity distribution was investigated at high pressures up to 50 GPa using synchrotron radiation at SPring-8 and a laboratory x-ray source generator of Ag Kα rotating anode generator. Using large diamond crystal windows instead of beryllium for the cell has several advantages for single-crystal diffraction study supplying the large Q-value.
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