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Cesium Bromide vs. Barium Fluoride

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

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 16
60
Knoop Hardness 20
80
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 7.5
25

Thermal Properties

Melting Onset (Solidus), °C 640
1370
Specific Heat Capacity, J/kg-K 270
420
Thermal Conductivity, W/m-K 0.9
9.0
Thermal Expansion, µm/m-K 48
18

Otherwise Unclassified Properties

Density, g/cm3 4.4
4.9
Light Transmission Range, µm 0.25 to 40
0.15 to 13
Refractive Index 1.6
1.6

Common Calculations

Stiffness to Weight: Axial, points 2.0
6.8
Stiffness to Weight: Bending, points 19
27
Thermal Diffusivity, mm2/s 0.76
4.4