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Barium Fluoride (BaF2) Optical Material

Barium fluoride is a non-glass, inorganic optical material. The graph bars on the material properties cards below compare barium fluoride to other non-glass optical ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

60 GPa 8.7 x 106 psi

Knoop Hardness


Poisson's Ratio


Shear Modulus

25 GPa 3.6 x 106 psi

Thermal Properties

Melting Onset (Solidus)

1370 °C 2500 °F

Specific Heat Capacity

420 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

9.0 W/m-K 5.2 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Otherwise Unclassified Properties


4.9 g/cm3 310 lb/ft3

Light Transmission Range

0.15 to 13 µm

Refractive Index


Common Calculations

Stiffness to Weight: Axial

6.8 points

Stiffness to Weight: Bending

27 points

Thermal Diffusivity

4.4 mm2/s

Followup Questions

Further Reading

Handbook of Optical Materials, Marvin J. Weber, 2003

Handbook of Optical Constants of Solids, Edward D. Palik (editor), 1998