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Barium Fluoride vs. Potassium Bromide

Both barium fluoride and potassium bromide are non-glass optical ceramics. There are 13 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 60
24
Poisson's Ratio 0.32
0.17
Shear Modulus, GPa 25
7.0

Thermal Properties

Melting Onset (Solidus), °C 1370
730
Specific Heat Capacity, J/kg-K 420
450
Thermal Conductivity, W/m-K 9.0
4.8
Thermal Expansion, µm/m-K 18
39

Otherwise Unclassified Properties

Density, g/cm3 4.9
2.8
Light Transmission Range, µm 0.15 to 13
0.22 to 26
Refractive Index 1.6
1.8

Common Calculations

Stiffness to Weight: Axial, points 6.8
4.7
Stiffness to Weight: Bending, points 27
35
Thermal Diffusivity, mm2/s 4.4
3.9