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寶石材料
Sapphire is a single crystal aluminum oxide (Al2O3). Its Mohs hardness is 9, it is one of the hardest materials. Sapphire has good mechanical strength, and it is also transparent from visible to IR spectrum. So, it is always used as window material where scratch resistance is required.
- Lattice Constant: a =4.75 A; c =12.97A
- Transparent Range: 180nm ~ 4500nm
- Density: 3.98g/cm3
- Mohs Hardness: 9
- Melting Point: 2030℃
- Thermal Conductivity: 0.04W/m/K
- Expansion Coefficient: 8.4x10-6/K
- Refractive Index: 1.755@1um
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Sapphire Material
