Silicon Carbide
Title: Silicon Carbide
CAS Registry Number: 409-21-2
Molecular Formula: CSi
Molecular Weight: 40.10
Percent Composition: C 29.95%, Si 70.04%
Line Formula: SiC
Literature References: Made by heating coke and sand (and salt as flux) in electric furnace.
Properties: Exceedingly hard, green to bluish-black, iridescent, sharp crystals; hardness = 9.5. d 3.23. Dielectric constant: 7.0. Electron mobility: >100 cm2/volt-sec. Hole mobility: >20 cm2/volt-sec. Band gap energy: 2.8 ev.
Density: d 3.23
CAUTION: Potential symptoms of overexposure are irritation of eyes, skin, upper respiratory system; cough. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 278.
Use: Polishing glass, granite; smoothing bisque ware; in sharpening-stones; abrasive; manuf porcelain, "emery" paper and wheels, shoe soles, refractory brick, furnace linings; antiskid pavements; in semiconductor technology.

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