Transition metal lamellar compounds of graphite as catalysts of graphite-to-diamond conversion

Kalashnikov, Ya. A.; Timofeyeva, N.V.; Farafontov, V. I.; Goldansky, V.I.; Stukan, R. A.; Nefedyev, V.A.; Vol'pin, M. E.; Novikov, Yu. N.; Lapkina, N. D.

doi:10.1016/0379-6779(82)90006-6

Cited by 8 publications

(2 citation statements)

References 3 publications

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“…Wentorf Jr and Bovenkerk (1961) also suggested that graphite might absorb enough catalytic metallic iron and nickel from nearby masses containing these elements to catalyze the formation of diamond in graphite. Laminar compounds of graphite with transition metals are also shown to be easily transformed into diamond in the solid state (Kalashnikov et al, 1982;Clarke and Uher, 1984). EBSD analyses of this study reveal the orientational relationship between graphite and diamond in a carbon grain as ð001Þ Gr ==ð111Þ Di and ½210 Gr ==½ 211 Di ð==½2 1 1 Di Þ (Fig.…”

Section: Mechanism Of Catalytic Transformation Of Graphite To Diamondmentioning

confidence: 94%

“…Nakamuta and Toh (2013) showed that transformation of graphite into diamond occur by chair-type puckering of the hexagonal carbon planes of graphite after sliding of these planes along the [210] direction of the original graphite. As such, it is reasonable to think that the metallic iron catalyst in ureilites promoted the sliding and puckering of the hexagonal carbon planes of graphite after intercalating into its interplanar spaces at a relatively low pressure Kalashnikov et al, 1982;Clarke and Uher, 1984).…”

Section: Mechanism Of Catalytic Transformation Of Graphite To Diamondmentioning

confidence: 99%

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In situ observation, X–ray diffraction and Raman analyses of carbon minerals in ureilites: Origin and formation mechanisms of diamond in ureilites

Nakamuta

Kitajima

Shimada

2016

Journal of Mineralogical and Petrological Sciences

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Carbon minerals in sixteen monomict ureilites which are variable in shock features in olivine were observed in situ by optical microscopy, scanning electron microscopy, X-ray powder diffraction, and Raman analyses. Euhedral blade-like shaped or amoeboid shaped graphite crystals occur in the very low-shock ureilites, not associated with diamond. In the low, medium, and high-shock ureilites, diamond occurs together with graphite. X-ray diffraction and Raman analyses reveal that crystallinity of diamond is relatively well in the low-shock ureilites, although it varies in a wide range in the high-shock ureilites. Diamond formation in the low-shock ureilites occurred as a result of solid-state catalytic transformation of graphite at a pressure lower than 10 GPa, with metallic iron as the catalyst, while diamond in the high-shock ureilites formed by spontaneous transformation of graphite together with the catalytic transformation at a pressure higher than 12 GPa. The relative crystal-axes orientations between graphite (Gr) and diamond (Di) determined by EBSD analyses in the lowshock Y-8448 ureilite is the same as that observed for graphite and diamond in a carbon grain from the highshock Goalpara ureilite. The metallic iron catalyst promoted the sliding and puckering of the hexagonal carbon planes of graphite in the solid-state transformation processes of graphite to diamond after intercalating into its interplanar spaces. It is shown that noble gas systematics in ureilites can be matched with the shock formation origin of diamond in ureilites.

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Section: Mechanism Of Catalytic Transformation Of Graphite To Diamondmentioning

confidence: 94%

Section: Mechanism Of Catalytic Transformation Of Graphite To Diamondmentioning

confidence: 99%

In situ observation, X–ray diffraction and Raman analyses of carbon minerals in ureilites: Origin and formation mechanisms of diamond in ureilites

Nakamuta

Kitajima

Shimada

2016

Journal of Mineralogical and Petrological Sciences

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Reduction of the laminar compound of graphite with FeCl3 by hydrogen at high pressure

et al. 1986

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Mössbauer study of the lattice location of 57Co implanted in graphite

Potter

Langouche

1983

Physics Letters A

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Transition metal lamellar compounds of graphite as catalysts of graphite-to-diamond conversion

Cited by 8 publications

References 3 publications

In situ observation, X–ray diffraction and Raman analyses of carbon minerals in ureilites: Origin and formation mechanisms of diamond in ureilites

In situ observation, X–ray diffraction and Raman analyses of carbon minerals in ureilites: Origin and formation mechanisms of diamond in ureilites

Reduction of the laminar compound of graphite with FeCl3 by hydrogen at high pressure

Mössbauer study of the lattice location of 57Co implanted in graphite

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