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Silicon Nitride vs. Lithium Fluoride

Silicon nitride belongs to the non-oxide engineering ceramics classification, while lithium fluoride belongs to the non-glass optical ceramics. There are 10 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 silicon nitride and the bottom bar is lithium fluoride.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 2.2 to 3.4
2.6
Dielectric Constant (Relative Permittivity) At 1 MHz 8.0 to 10
9.0
Elastic (Young's, Tensile) Modulus, GPa 140 to 310
120
Poisson's Ratio 0.24 to 0.27
0.27
Specific Heat Capacity, J/kg-K 720 to 800
1560
Stiffness to Weight: Axial, points 34 to 53
24
Stiffness to Weight: Bending, points 65 to 78
62
Thermal Conductivity, W/m-K 12 to 31
12
Thermal Diffusivity, mm2/s 7.5 to 13
2.9
Thermal Expansion, µm/m-K 2.5 to 3.2
32