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Potassium Bromide vs. Cesium Iodide

Both potassium bromide and cesium iodide 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 potassium bromide and the bottom bar is cesium iodide.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 24
4.0
Poisson's Ratio 0.17
0.21
Shear Modulus, GPa 7.0
6.2

Thermal Properties

Melting Onset (Solidus), °C 730
620
Specific Heat Capacity, J/kg-K 450
200
Thermal Conductivity, W/m-K 4.8
1.1
Thermal Expansion, µm/m-K 39
48

Otherwise Unclassified Properties

Density, g/cm3 2.8
4.5
Light Transmission Range, µm 0.22 to 26
0.25 to 55
Refractive Index 1.8
1.9

Common Calculations

Stiffness to Weight: Axial, points 4.7
0.49
Stiffness to Weight: Bending, points 35
12
Thermal Diffusivity, mm2/s 3.9
1.2