Potassium Bromide(KBr) optical window

Crystal structure

Cubic

Growth method

Crystallization method

Lattice constant

a=5.596Å    

Density

2.75（g/cm3）

Mohs hardness

2

Melting point

730℃

Transmission band

0.23~25μm

Refractive index

1.49025, 1.525 at 10μm

Thermal Conductivity

4.816 W/mK @ 319K

Thermal expansion coefficient

43×10-6 /°K @ 300K

Dielectric constant

4.9 at 1MHz

Young's modulus

26.8 GPa

Deliquescence

NaCl is a water-soluble crystal, it is easily deliquescent and can not be polished by CMP

Packing

100 grade clean bag, 1000 grade clean room