Transition of polycrystalline graphite to diamond occurs after hydrostatic pressure treatment near 70 GPa [3]. The development of solid-state phase transitions, including those at the stage of nucleation and development of a new phase practically always is connected with the relaxation of elastic ...
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An association between the degree of structural perfection of the graphite and the success in producing diamond crystals was found to exist even for conditions outside the field of diamond stability in the carbon – equilibrium diagram. 展开 ...
Analysis of Electron Spectra of Carbon Allotropes (Diamond, Graphite, Fullerene) by Density Functional Theory Calculations Using the Model Molecules X-ray photoelectron, emission, and Auger electron spectra of diamond, graphite, and fullerene have been analyzed by deMon density-functional theory (DFT)...
heated to 850 °C at a rate of 100 °C min−1and sintered for 2 h to reduce the porosity in the graphite capsule, which is known to prevent loss of sulfide-rich melt into graphite74. Subsequently, the samples were heated to the target temperature and were held at the ...
Electrocatalytic nanocarbon (EN) is a class of material receiving intense interest as a potential replacement for expensive, metal-based electrocatalysts for energy conversion and chemical production applications. The further development of EN will requi
Given : C("diamond")+O(2)rarrCO(2),DeltaH=-395 kJ C("graphite")+O(2)rarrCO(2),DeltaH=-393 kJ The enthalpy of formation of diamond from graphite is
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The process was performed in a vacuum up to 1000 °C, thereafter, Ar atmosphere was used to avoid the sublimation of the graphite punches. The relative density of samples was measured by the Archimedes’ principle using the theoretical densities calculated by the Rietveld analysis of the ...