Question

8. Given the relative costs, making diamond from graphite would appear to be an economically sound proposition. The standard free energy difference for the solid-solid phase change C(s, graphite)C(s, diamond) is Δ๔ : μdiamond-graphite-2.900 kJ mol-1 (at 25°C), The densities of these materials are ρ(diamond): 3.51 g cm-3 and ρ(graphite): 2.26 g cm-3. Estimate the pressure required to convert graphite to diamond

Answer 1

Given data: Given the realative costs making diamond from graphitic would appear to be an economically sound proposition, the standard force energy difference for the solid-solid phase change CVC Diamond films: Diamond can nowadays be deposited by CVD as a continuous film on a veriety of substrate Materials. These films are poly crystalline. That is consist of many small diamond crystallites with have fused together in the early stages of growth In order for continuous film \r\n to occur. A sufficient density of crystalline must be formed in the early stage of growth, In general sub states must undergo an nucleation enhancing pre-treatment to allow this. Chemical vapour Deposition: As diamond is purely carbon. Diamond growth could conceptually be effected by adding one carbon atom at a time to an initial template, so that a terahedrally bonded carbon network diamond results. This would be accomplished from the gas phase at lower pressures than for the techniqe, an obvious advantage in terms