Kinetics of the graphite-diamond transformation in aqueous fluid determined by in-situ X-ray diffractions at high pressures and temperatures

Okada, Taku; Utsumi, Wataru; Kaneko, Hiroshi*; Turkevich, V.*; Hamaya, Nozomu; Shimomura, Osamu*

The graphite-diamond transformation was investigated by in situ time-resolved X-ray diffraction experiments using aqueous fluid containing dissolved MgO as the diamond forming catalyst under conditions of 6.6-8.9 GPa and 1400-1835 $^{circ}$ C. The transformed volume fractions of diamond as a function of time under various pressure-temperature conditions were obtained and analyzed using the JMAK rate equation. Variations in the nucleation and growth processes during diamond formation as a function of pressure and temperature were clarified.

Language	:	English
Journal	:	Physics and Chemistry of Minerals
Volume	:	31
Number	:	4
Pages	:	p.261 - 268
Publication Year/Month	:	2004/05
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Paper URL	:	https://doi.org/10.1007/s00269-004-0386-y
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Keywords	:	放射光; 高温; 高圧; ダイヤモンド; 相転移; X線回折
Research Facility	:	SPring-8(大型放射光施設)
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InCites™	:	Percentile:41.33 Category:Materials Science, Multidisciplinary
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Registration No. : A20040067
JAEA Abstracts No. : 320696
Paper Submission No. : 21128

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