Title: EET Theory Analysis of Direct Transformation from Graphite to Diamond at Ultra High-pressure and High-temperature
Abstract: The formation mechanism of how graphite can be transformed into diamond at ultra highpressure and high-temperature(UHPHT) has been debated for decades.According to the empirical electron theory of solid and molecules(EET),the valence electron structures of graphite and diamond were constructed for the conditions of diamond synthesis by the static pressure,respectively.The relative differences in electron density were subsequently obtained for the interfaces of 12 different combinations of crystal planes of graphite and diamond at UHPHT.The results indicate that these relative differences in the static pressure condition are much greater than 10%,the differences of valence electron structures at the graphite/diamond interfaces are too large to induce the direct transformation of graphite into diamond.Therefore,the graphite might have to firstly decompose into a metastable phase before it can be transformed into cubic diamond at UHPHT.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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Cited By Count: 1
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