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Cadmium Telluride vs. Gallium Arsenide

Both cadmium telluride and gallium arsenide are non-glass optical ceramics.

For each property being compared, the top bar is cadmium telluride and the bottom bar is gallium arsenide.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
85
Knoop Hardness 45
750
Poisson's Ratio 0.41
0.31

Thermal Properties

Melting Onset (Solidus), °C 1090
1400
Specific Heat Capacity, J/kg-K 210
360
Thermal Conductivity, W/m-K 5.0
47
Thermal Expansion, µm/m-K 5.9
5.6

Otherwise Unclassified Properties

Density, g/cm3 5.9
5.3
Light Transmission Range, µm 1.0 to 25
1.0 to 16
Refractive Index 2.6
3.4

Common Calculations

Stiffness to Weight: Axial, points 4.3
8.9
Stiffness to Weight: Bending, points 20
28
Thermal Diffusivity, mm2/s 4.1
25