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Cesium Iodide vs. Optical Silicon

Both cesium iodide and optical silicon are non-glass optical ceramics. There are 14 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is cesium iodide and the bottom bar is optical silicon.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 4.0
150
Knoop Hardness 20
1130
Poisson's Ratio 0.21
0.28
Shear Modulus, GPa 6.2
80

Thermal Properties

Melting Onset (Solidus), °C 620
1560
Specific Heat Capacity, J/kg-K 200
700
Thermal Conductivity, W/m-K 1.1
150
Thermal Expansion, µm/m-K 48
3.0

Otherwise Unclassified Properties

Density, g/cm3 4.5
2.3
Light Transmission Range, µm 0.25 to 55
1.2 to 15
Refractive Index 1.9
3.5

Common Calculations

Stiffness to Weight: Axial, points 0.49
35
Stiffness to Weight: Bending, points 12
75
Thermal Diffusivity, mm2/s 1.2
93