Abstract
Structural transformations of the cumulene form of amorphous carbyne which are induced by heating at high pressure (7.7 GPa) are investigated. These can be described by the sequence amorphous phase — crystal — amorphous phase — disordered graphite. Raman scattering shows that predominately the chain structure of carbyne remains at the first three stages. It was found that the intermediate crystalline phase is an unknown modification of carbon whose structure is identified as cubic (a=3.145 Å). A mechanism of structural transformations in carbyne that involves the formation of new covalent bonds between chains is discussed.
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Pis’ma Zh. Éksp. Teor. Fiz. 66, No. 4, 237–242 (25 August 1997)
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Varfolomeeva, T.D., Popova, S.V., Lyapin, A.G. et al. Structural transformations of the cumulene form of amorphous carbyne at high pressure. Jetp Lett. 66, 255–260 (1997). https://doi.org/10.1134/1.567463
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DOI: https://doi.org/10.1134/1.567463