NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2020, 11 (4), P. 408–416
Supercritical fluid synthesis and possible properties of “cubic graphite”
A.V. Pokropivny – Frantsevich Institute for Problems of Materials Science NASU, Kyiv; G. V. Kurdyumov Institute for Metal Physics, NASU, Kyiv, Ukraine; apokr@ukr.net
A. N. Enyashin – Institute of Solid State Chemistry UB RAS, Ekaterinburg, Russia; enyashin@ihim.uran.ru
A. S. Smolyar – Frantsevich Institute for Problems of Materials Science NASU, Kyiv; M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation NASU, Kyiv, Ukraine
V. A. Kuts – Institute of Magnetism NASU, Kyiv, Ukraine
V. G. Gurin – Institute of Magnetism NASU, Kyiv, Ukraine
S. A. Antipov – Institute of Magnetism NASU, Kyiv, Ukraine
P. M. Silenko – Frantsevich Institute for Problems of Materials Science NASU, Kyiv, Ukraine
Yu. M. Solonin – Frantsevich Institute for Problems of Materials Science NASU, Kyiv, Ukraine
We report on supercritical fluid synthesis of an intermediate carbon phase – austite – at a pressure of 180 MPa and temperatures 500–700°C from soot as a precursor and supercritical carbon dioxide as a solvent. According to the results of electron and X-ray diffractions, spectral measurements and density-functional theory calculations, the observed carbon phase is proved to be cubic with a lattice parameter value of 8.96±0.05 A° and a possible structural type as for KFI zeolite.
Keywords: crystal growth, carbon allotropes, electron microscopy, X-ray diffraction, DFT calculations.
PACS 81.10.Dn, 61.66.Bi, 61.48.+c, 61.50.Ah
DOI 10.17586/2220-8054-2020-11-4-408-416
