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Potassium Chloride vs. Cesium Bromide

Both potassium chloride and cesium 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. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is potassium chloride and the bottom bar is cesium bromide.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 28
16
Poisson's Ratio 0.18
0.28
Shear Modulus, GPa 8.5
7.5

Thermal Properties

Melting Onset (Solidus), °C 780
640
Specific Heat Capacity, J/kg-K 690
270
Thermal Conductivity, W/m-K 6.5
0.9
Thermal Expansion, µm/m-K 36
48

Otherwise Unclassified Properties

Density, g/cm3 2.0
4.4
Light Transmission Range, µm 0.21 to 20
0.25 to 40
Refractive Index 1.6
1.6

Common Calculations

Stiffness to Weight: Axial, points 7.7
2.0
Stiffness to Weight: Bending, points 51
19
Thermal Diffusivity, mm2/s 4.7
0.76