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Diamond powder and graphite powder

2018-08-02
Diamond powder and graphite powder
 
Both graphite and diamond are carbonaceous, their chemical properties are identical, but diamond and graphite are not the same substance, they are allomorphs composed of the same elements. The difference is the physical structural features.The chemical formula of both is C.

but what are the differences between diamond powder and graphite powder ?
 
The regular hexagon formed between the graphite atoms is a planar structure and is in the form of a sheet.
 
The diamond atoms are three-dimensional regular tetrahedral structures.
 
Comparison of the melting points of diamond and graphite:
 
The melting point of diamond is 3550 ° C, and the melting point of graphite is 3652 ° C ~ 3697 ° C (sublimation). The melting point of graphite is higher than that of diamond.
 
From the inside of the sheet, graphite is an atomic crystal; from the perspective of the sheet, graphite is a molecular crystal (in general, graphite should be a mixed crystal); and diamond is an atomic crystal. The melting point of the graphite crystal is higher than that of the diamond, which seems unbelievable, but the bond length of the covalent bond in the graphite crystal layer is 1.42×10-10 m, and the bond length of the covalent bond in the diamond crystal is 1.55×10-10 m. The same as the covalent bond, the smaller the bond length, the larger the bond energy, the stronger the bond, the more difficult it is to destroy it, and the more energy it needs to be, so the melting point should be higher.