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Calcium Fluoride vs. Thallium Bromoiodide

Both calcium fluoride and thallium bromoiodide are non-glass optical ceramics. There are 13 material properties with values for both materials. Properties with values for just one material (1, 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 calcium fluoride and the bottom bar is thallium bromoiodide.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 80
31
Poisson's Ratio 0.26
0.37
Shear Modulus, GPa 34
12

Thermal Properties

Melting Onset (Solidus), °C 1420
420
Specific Heat Capacity, J/kg-K 860
150
Thermal Conductivity, W/m-K 9.7
0.55
Thermal Expansion, µm/m-K 19
6.0

Otherwise Unclassified Properties

Density, g/cm3 3.2
7.4
Light Transmission Range, µm 0.15 to 9.0
0.6 to 40
Refractive Index 1.4
2.4

Common Calculations

Stiffness to Weight: Axial, points 14
2.3
Stiffness to Weight: Bending, points 45
14
Thermal Diffusivity, mm2/s 3.5
0.5