Chemical properties of diamond

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The chemical properties of diamond are stable and can withstand non-oxidizing acids at various temperatures, but they are not resistant to strong alkali, oxates and molten metals. For example, after the erosion of {111} surface of diamond with strong oxidants potassium perchlorate (KCIO) and sodium perchlorate (NaCIO) at 380℃ for 181h, the surface will corrode. Dissolution occurs in molten sodium nitrate salts at 430 ° C, as well as in molten metals.

Chemical stability

oxidizability

Oxidation begins at 600 ° C in oxygen, combustion at 720 ° C, and combustion at 850 ° C in air. Low vacuum, such as the residual oxygen in 1kPa ~ 1Pa environment, will generate a dense black graphite film on the diamond surface, which can be removed by hot perchloric acid or aqua regia. The formation temperature of the graphite film is above 600℃, but it is not a solid phase transition from diamond to graphite, but a transformation product of carbon monoxide or carbon dioxide. When heated to 1500℃ in a clean inert gas, the graphitization reaction of diamond will begin, and at 2100℃, the graphitization speed is accelerated. The erosion rate of 2000A /min can be achieved by ion beam erosion technique.

Surface property

Diamond is a non-polar mineral, its surface is high oleophilic, wetting contact Angle of 80° ~ 120°. The purity of the diamond itself and the cleanliness of the surface will affect the performance of the surface of the residual corundum.

Chemical properties of diamond

Optical properties of diamond

Application areas of diamond

Optical properties of diamond

Application areas of diamond