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S.E. Iyuke,M.O. Daramola,P. Mokena,A. Marshall 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
Thermodynamic stability of synthetic diamond films, produced at 1000–1100 8C from a swirledcontinuousCatalytic Chemical Vapour Deposition (CCVD) reactor, is reported. Simple photographs of theas-produced samples displayed several colours that characterize typical beam diffraction spectra ofdiamond. Raman spectrum revealed a single sharp diamond peak at 1381.4 cm 1 and graphite peaks of1560 and 1360 cm 1, confirming formation of graphitic carbons and production of graphitic diamond. The quantity of the as-prepared diamond was proportional to the acetylene to hydrogen ratio used in thereactor feed and the apparent proportional relationship between the acetylene and hydrogen ratio andthe quantity of diamonds produced only holds at sufficient quantity of acetylene. The synthesizeddiamond films were unstable at temperature of 90 8C, but displayed phase stability when stored at roomtemperature in a dark cupboard for 1.5 years. However, presence of impurities in the diamond filmsnegatively affects their thermodynamic stability, and effective purification method to remove theimpurities could improve the thermodynamic stability.