Optical Silicon (Si) Optical Material

Optical silicon is a non-glass optical ceramic material.

Material Properties

Compressive (Crushing) Strength120 MPa (17 x 103 psi)

Density2.3 g/cm3 (140 lb/ft3)

Dielectric Constant (Relative Permittivity) At 1 MHz12

Elastic (Young's, Tensile) Modulus150 GPa (22 x 106 psi)

Flexural Strength300 MPa (44 x 103 psi)

Fracture Toughness3.5 MPa-m1/2

Knoop Hardness1130

Light Transmission Range1.2 to 15 µm

Melting Onset (Solidus)1560 °C (2840 °F)

Poisson's Ratio0.28

Refractive Index3.5

Shear Modulus80 GPa (12 x 106 psi)

Specific Heat Capacity700 J/kg-K

Strength to Weight Ratio48 kN-m/kg

Tensile Strength: Ultimate (UTS)110 MPa (16 x 103 psi)

Thermal Conductivity150 W/m-K

Thermal Diffusivity93 m2/s

Thermal Expansion3.0 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