Basavalingu, B. and Madhusudan, P. and Byrappa, K. and Yoshimura, M. (2010) Hydrothermal synthesis of sp3 bonded carbon from β-SiC–organic compound system. Materials Research Innovations, 14 (1). pp. 27-33. ISSN 1433-075X
Full text not available from this repository. (Request a copy)Abstract
Synthesis of carbon polymorphs through the decomposition of metal carbides was studied employing hydrothermal technique in the pressure and temperature ranges of 100-200 MPa and 350-800 degrees C respectively. It was observed that dissociation of beta-SiC into SiO2 occurred in the presence of organic compounds and controlled free elemental carbon phase formation. The organic compounds are known to dissociate at low temperature to C-O-H supercritical fluids under supercritical hydrothermal condition which have great influence on the decomposition of metal carbides. The scanning electron microscopic (SEM) studies of beta-SiC-organic compounds system reveal that the bulk of the carbon particles formed are spherical or ovoid shaped particles and in some runs, the authors find the formation of nanosized octahedral crystallites at the inner walls of the hallow spherical carbon particles exhibiting sp(3) hybridisation. The microRaman spectral studies of carbon crystallites reveal that they have typical spectra of sp(3) hybridisation, which clearly demonstrates the formation of nanosized diamond crystallites. The X-ray diffraction studies of the silicon carbide-water experimental run products shows only the lines of silica which are either quartz or cristobalite phase and no traces of carbon were seen.
| Item Type: | Article |
|---|---|
| Subjects: | F Earth Science > Geology |
| Divisions: | Department of > Earth Science |
| Depositing User: | LA manjunath user |
| Date Deposited: | 17 Jul 2019 06:28 |
| Last Modified: | 17 Jun 2022 10:43 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/5305 |
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