Calcium Fluoride vs. Cesium Bromide
Both calcium fluoride and cesium bromide are non-glass optical ceramics.
For each property being compared, the top bar is calcium fluoride and the bottom bar is cesium bromide.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 80 | |
| 16 |
| Knoop Hardness | 160 | |
| 20 |
| Poisson's Ratio | 0.26 | |
| 0.28 |
| Shear Modulus, GPa | 34 | |
| 7.5 |
Thermal Properties
| Melting Onset (Solidus), °C | 1420 | |
| 640 |
| Specific Heat Capacity, J/kg-K | 860 | |
| 270 |
| Thermal Conductivity, W/m-K | 9.7 | |
| 0.9 |
| Thermal Expansion, µm/m-K | 19 | |
| 48 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.2 | |
| 4.4 |
| Light Transmission Range, µm | 0.15 to 9.0 | |
| 0.25 to 40 |
| Refractive Index | 1.4 | |
| 1.6 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 2.0 |
| Stiffness to Weight: Bending, points | 45 | |
| 19 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 0.76 |