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Potassium Bromide vs. Magnesium Fluoride

Both potassium bromide and magnesium fluoride are non-glass optical ceramics. There are 14 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 24
130
Poisson's Ratio 0.17
0.27
Shear Modulus, GPa 7.0
76

Thermal Properties

Melting Onset (Solidus), °C 730
1260
Specific Heat Capacity, J/kg-K 450
980
Thermal Conductivity, W/m-K 4.8
28
Thermal Expansion, µm/m-K 39
11

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 4.9
5.2

Otherwise Unclassified Properties

Density, g/cm3 2.8
3.2
Light Transmission Range, µm 0.22 to 26
0.12 to 7.0
Refractive Index 1.8
1.4

Common Calculations

Stiffness to Weight: Axial, points 4.7
22
Stiffness to Weight: Bending, points 35
52
Thermal Diffusivity, mm2/s 3.9
8.8