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Cesium Iodide vs. Zinc Sulfide

Both cesium iodide and zinc sulfide are non-glass optical ceramics. There are 12 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is cesium iodide and the bottom bar is zinc sulfide.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 4.0
75
Poisson's Ratio 0.21
0.28

Thermal Properties

Melting Onset (Solidus), °C 620
1830
Specific Heat Capacity, J/kg-K 200
520
Thermal Conductivity, W/m-K 1.1
27
Thermal Expansion, µm/m-K 48
6.5

Otherwise Unclassified Properties

Density, g/cm3 4.5
4.1
Light Transmission Range, µm 0.25 to 55
0.37 to 14
Refractive Index 1.9
2.3

Common Calculations

Stiffness to Weight: Axial, points 0.49
10
Stiffness to Weight: Bending, points 12
34
Thermal Diffusivity, mm2/s 1.2
13