Cesium Iodide (CsI) Optical Material

Cesium iodide is a non-glass optical ceramic material.

Material Properties

Density4.5 g/cm3 (280 lb/ft3)

Elastic (Young's, Tensile) Modulus4.0 GPa (0.58 x 106 psi)

Knoop Hardness20

Light Transmission Range0.25 to 55 µm

Melting Onset (Solidus)620 °C (1150 °F)

Poisson's Ratio0.21

Refractive Index1.9

Shear Modulus6.2 GPa (0.9 x 106 psi)

Specific Heat Capacity200 J/kg-K

Thermal Conductivity1.1 W/m-K

Thermal Diffusivity1.2 m2/s

Thermal Expansion48 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