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  • Products Name: Sapphire
  • Products Number: Sapphire
  • Published: 2017-03-02
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  • Views : 27

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Sapphire is a single crystal aluminum oxide (Al203 ).

It is one of the hardest materials. sapphire has good transmission characteristics over the visible, and near IR spectrum.

It exhibits high mechanical strength, chemical resistance, thermal conductivity and thermal stability.

It is often used as window materials in specific field such as space technology

where scratch or high temperature resistance is required.

Crystal Symmetry Hexagonal   System
Lattice constant A a =4.75 ; c =12.97
Transparence range μm 0.18- 4.5
Density g/cm 3 3.98
Mohs hardness   9
Melting point 2030
Thermal conductivity W/m/K 0.04
Expansion coefficien 10 -6 /K 8.4
Refractive Index 1.0 m m 1.755