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${it In situ}$ X-ray observations of the diamond formation process in the C-H$$_{2}$$O-MgO system

Okada, Taku; Utsumi, Wataru; Shimomura, Osamu

In order to clarify the mechanism of diamond formation in the Earth's mantle, we studied the diamond formation in the H$$_{2}$$O-fluid by in situ X-ray observation with the simple C-H$$_{2}$$O-MgO system. The results suggest that the solubility of MgO component increases greatly as a function of pressure. However, the generation of fluid is not a sufficient condition for diamond formation, because the carbon quantity in fluid is not increased drastically until just before the diamond formation temperature. This is the first report of the kinetics study in fluid using synchrotron radiation.

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Category:Physics, Condensed Matter

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