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Cesium Iodide vs. Silicon Nitride

Cesium iodide belongs to the non-glass optical ceramics classification, while silicon nitride belongs to the non-oxide engineering ceramics. There are 9 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

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

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 4.5
2.2 to 3.4
Elastic (Young's, Tensile) Modulus, GPa 4.0
140 to 310
Poisson's Ratio 0.21
0.24 to 0.27
Specific Heat Capacity, J/kg-K 200
720 to 800
Stiffness to Weight: Axial, points 0.49
34 to 53
Stiffness to Weight: Bending, points 12
65 to 78
Thermal Conductivity, W/m-K 1.1
12 to 31
Thermal Diffusivity, mm2/s 1.2
7.5 to 13
Thermal Expansion, µm/m-K 48
2.5 to 3.2