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Cesium Iodide vs. Magnesium Fluoride

Both cesium iodide and magnesium fluoride are non-glass optical ceramics. There are 13 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 magnesium fluoride.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 4.0
130
Poisson's Ratio 0.21
0.27
Shear Modulus, GPa 6.2
76

Thermal Properties

Melting Onset (Solidus), °C 620
1260
Specific Heat Capacity, J/kg-K 200
980
Thermal Conductivity, W/m-K 1.1
28
Thermal Expansion, µm/m-K 48
11

Otherwise Unclassified Properties

Density, g/cm3 4.5
3.2
Light Transmission Range, µm 0.25 to 55
0.12 to 7.0
Refractive Index 1.9
1.4

Common Calculations

Stiffness to Weight: Axial, points 0.49
22
Stiffness to Weight: Bending, points 12
52
Thermal Diffusivity, mm2/s 1.2
8.8