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Why use 4H-SiC(silicon carbide) instead of 3C or 6H?

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Assuming that the 3C and 2H structures are extremes in the parameter describing the percentage of hexagonal close packing (often called hexagonality) with 0 and 100%, respectively, we get the hexagonal nature of 33% for 6H structure, 40% for 15R structure, and 50% for 4H structure. read more

Pure silicon carbide can be made by the Lely process, in which SiC powder is sublimed into high-temperature species of silicon, carbon, silicon dicarbide (SiC 2), and disilicon carbide (Si 2 C) in an argon gas ambient at 2500 °C and redeposited into flake-like single crystals, sized up to 2×2 cm, at a slightly colder substrate. read more

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