[PPS03-P28] Phase relation of MgSO4–H2O system under low temperature and high pressure
Keywords:icy body, high pressure, Magnesium sulfate
The pressure was calculated using the ruby fluorescence method. Raman spectroscopy and textural change in the sample room under optical microscope were used for phase identification in laboratory experiments.
To confirm the results of phase identification, we also conducted X-ray diffraction experiments of the solid phases of MgSO4-H2O system up to about 5GPa at room temperature, at NE-1A station, PF-AR, KEK. We identified Ices VI and VII, magnesium pentahydrate, MgSO4・5H2O, Mg(HSO4)2 in the samples at high pressure.
Our results were different from previous study by Ohtani and Nakamura(2011), who identified magnesium heptahydrate, MgSO4・7H2O as the high-pressure phase .
We will report the detailed results of both Raman spectroscopy and X-ray diffraction experiments and possible phase diagram of MgSO4-H2O system and their application to the icy bodies.