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Calcium Fluoride vs. Cesium Bromide

Both calcium fluoride and cesium bromide are non-glass optical ceramics.

For each property being compared, the top bar is calcium fluoride and the bottom bar is cesium bromide.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 80
16
Knoop Hardness 160
20
Poisson's Ratio 0.26
0.28
Shear Modulus, GPa 34
7.5

Thermal Properties

Melting Onset (Solidus), °C 1420
640
Specific Heat Capacity, J/kg-K 860
270
Thermal Conductivity, W/m-K 9.7
0.9
Thermal Expansion, µm/m-K 19
48

Otherwise Unclassified Properties

Density, g/cm3 3.2
4.4
Light Transmission Range, µm 0.15 to 9.0
0.25 to 40
Refractive Index 1.4
1.6

Common Calculations

Stiffness to Weight: Axial, points 14
2.0
Stiffness to Weight: Bending, points 45
19
Thermal Diffusivity, mm2/s 3.5
0.76