Magnesium Oxide

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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)