Magnesium Oxide
Crystalline magnesia is processed from high purity calcinated magnesia arc furnaces at temperatures around 2800 oC. The crystal is transparent and permits good transmission of light ultraviolet to infrared ranges. The electrical and thermal resistivities are also excellent.
Physical Properties:
Formula: MgO
Crystal Structure: Cubic system
Lattice Constant: a = 4.212
Melting Point: 2780 oC
Dielectric Constant:
at 17 kHz: 100
at 28 kHz: 110
at 34 kHz: 111
Coefficient of Thermal Expansion: 8.0 x 10-6/ oC (at 100 oC)
Density: 3.58
Hardness (Mohs scale): 5.8
Specific Resistivity: >10 17ohms-cm
Cleavage: (100)