MAGNESIUM OXIDE

Physical Properties of 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)

              The 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.