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Hafnia (Hafnium Oxide, HfO2)

Hafnia is an oxide-based engineering ceramic. It has the highest density among oxide-based engineering ceramics. In addition, it has the lowest heat capacity and a very low thermal conductivity. The graph bars on the material properties cards below compare hafnia to other oxide-based engineering 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.

Thermal Properties

Maximum Temperature: Mechanical

2800 °C 5070 °F

Melting Onset (Solidus)

2900 °C 5250 °F

Specific Heat Capacity

120 J/kg-K 0.029 BTU/lb-°F

Thermal Conductivity

1.1 W/m-K 0.64 BTU/h-ft-°F

Thermal Expansion

6.0 µm/m-K

Other Material Properties

Density

9.7 g/cm3 610 lb/ft3

Elastic (Young's, Tensile) Modulus

57 GPa 8.3 x 106 psi

Electrical Resistivity Order of Magnitude

9.0 10x Ω-m

Common Calculations

Stiffness to Weight: Axial

3.3 points

Stiffness to Weight: Bending

13 points

Thermal Diffusivity

0.95 m2/s

Followup Questions

Further Reading

Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005