Why Diamond has higher melting point than Silicon Carbide?
1 Answer
Neither diamond nor silicon carbide melts at standard pressures.
Explanation:
However, they both sublimate at high temperatures.
Structures
Both diamond and silicon carbide have a tetrahedral covalent network structure.
Diamond
Silicon carbide
Physical Properties
Diamond does not melt at ordinary pressures. It converts to graphite and sublimates at about 3680 °C.
Silicon carbide sublimates at about 2700 °C.
Explanation
The difference appears to be caused by the differences in bond lengths and bond strengths.
Silicon carbide has a
Diamond has a much shorter
Thus, it takes more energy to vaporize diamond, and diamond has the higher sublimation temperature.