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Cesium Iodide vs. Barium Fluoride

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

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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