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Barium Fluoride vs. Fused Silica

Barium fluoride belongs to the non-glass optical ceramics classification, while fused silica belongs to the glass and glass-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. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is barium fluoride and the bottom bar is fused silica.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 60
73
Knoop Hardness 80
570
Poisson's Ratio 0.32
0.17
Shear Modulus, GPa 25
31

Thermal Properties

Melting Onset (Solidus), °C 1370
1900
Specific Heat Capacity, J/kg-K 420
720
Thermal Conductivity, W/m-K 9.0
1.4
Thermal Expansion, µm/m-K 18
0.5

Otherwise Unclassified Properties

Density, g/cm3 4.9
2.2
Light Transmission Range, µm 0.15 to 13
0.16 to 3.5
Refractive Index 1.6
1.5

Common Calculations

Stiffness to Weight: Axial, points 6.8
18
Stiffness to Weight: Bending, points 27
63
Thermal Diffusivity, mm2/s 4.4
0.85