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Barium Fluoride vs. Cesium Iodide

Both barium fluoride and cesium iodide are non-glass optical ceramics.

For each property being compared, the top bar is barium fluoride and the bottom bar is cesium iodide.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 60
4.0
Knoop Hardness 80
20
Poisson's Ratio 0.32
0.21
Shear Modulus, GPa 25
6.2

Thermal Properties

Melting Onset (Solidus), °C 1370
620
Specific Heat Capacity, J/kg-K 420
200
Thermal Conductivity, W/m-K 9.0
1.1
Thermal Expansion, µm/m-K 18
48

Otherwise Unclassified Properties

Density, g/cm3 4.9
4.5
Light Transmission Range, µm 0.15 to 13
0.25 to 55
Refractive Index 1.6
1.9

Common Calculations

Stiffness to Weight: Axial, points 6.8
0.49
Stiffness to Weight: Bending, points 27
12
Thermal Diffusivity, mm2/s 4.4
1.2