Potassium Bromide (KBr) Optical Material

Potassium bromide is a non-glass optical ceramic material.

Material Properties

Density2.8 g/cm3 (170 lb/ft3)

Dielectric Constant (Relative Permittivity) At 1 MHz4.9

Elastic (Young's, Tensile) Modulus24 GPa (3.5 x 106 psi)

Electrical Dissipation At 1 MHz0.00020

Light Transmission Range0.22 to 26 µm

Melting Onset (Solidus)730 °C (1350 °F)

Poisson's Ratio0.17

Refractive Index1.8

Shear Modulus7.0 GPa (1.0 x 106 psi)

Specific Heat Capacity450 J/kg-K

Thermal Conductivity4.8 W/m-K

Thermal Diffusivity3.8 m2/s

Thermal Expansion39 µm/m-K

The length of each bar compares the given value to the highest value in the database.

Further Reading

Handbook of Optical Constants of Solids, Edward D. Palik (editor), 1998

Handbook of Optical Materials, Marvin J. Weber, 2003