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Assertion :Pure silicon carbide can be made by Lely process. Reason: Lely method is concerned with the production of silicon carbide crystals by evaporation.
Assertion :Pure silicon carbide can be made by Lely process. Reason: Lely method is concerned with the production of silicon carbide crystals by evaporation.
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Solution
The correct option is C Assertion is correct but Reason is incorrect
Pure silicon carbide can be made by Lely process in which SiC powder is sublimated in argon atmosphere at 25000C and redeposited into flake like single crystals,sized upto 2×2cm2, at a slightly colder substrate.This process yields high quality single crystals,mostly of 6H−SiC phase due to high growth temperature.Cubic SiC is usually grown by the more expensive process of chemical vapour deposition(CVD).It uses sublimation of silica powder.
Pure silicon carbide can be made by Lely process in which SiC powder is sublimated in argon atmosphere at 25000C and redeposited into flake like single crystals,sized upto 2×2cm2, at a slightly colder substrate.This process yields high quality single crystals,mostly of 6H−SiC phase due to high growth temperature.Cubic SiC is usually grown by the more expensive process of chemical vapour deposition(CVD).It uses sublimation of silica powder.
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