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Gallium Arsenide vs. Potassium Bromide

Both gallium arsenide and potassium bromide are non-glass optical ceramics. There are 12 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is gallium arsenide and the bottom bar is potassium bromide.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 85
24
Poisson's Ratio 0.31
0.17

Thermal Properties

Melting Onset (Solidus), °C 1400
730
Specific Heat Capacity, J/kg-K 360
450
Thermal Conductivity, W/m-K 47
4.8
Thermal Expansion, µm/m-K 5.6
39

Otherwise Unclassified Properties

Density, g/cm3 5.3
2.8
Light Transmission Range, µm 1.0 to 16
0.22 to 26
Refractive Index 3.4
1.8

Common Calculations

Stiffness to Weight: Axial, points 8.9
4.7
Stiffness to Weight: Bending, points 28
35
Thermal Diffusivity, mm2/s 25
3.9