MakeItFrom.com
Menu (ESC)

Lithium Fluoride vs. Synthetic Sapphire

Lithium fluoride belongs to the non-glass optical ceramics classification, while synthetic sapphire belongs to the oxide-based engineering ceramics. There are 14 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is lithium fluoride and the bottom bar is synthetic sapphire.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
450
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 52
150

Thermal Properties

Melting Onset (Solidus), °C 870
2050
Specific Heat Capacity, J/kg-K 1560
760
Thermal Conductivity, W/m-K 12
30
Thermal Expansion, µm/m-K 32
5.3

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 9.0
10

Otherwise Unclassified Properties

Density, g/cm3 2.6
4.0
Light Transmission Range, µm 0.12 to 6.5
0.17 to 5.5
Refractive Index 1.4
1.8

Common Calculations

Stiffness to Weight: Axial, points 24
63
Stiffness to Weight: Bending, points 62
64
Thermal Diffusivity, mm2/s 2.9
9.9