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CVD Diamond vs. Hafnia

CVD diamond belongs to the non-oxide engineering ceramics classification, while hafnia belongs to the oxide-based engineering ceramics. There are 9 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 CVD diamond and the bottom bar is hafnia.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 3.5
9.7
Elastic (Young's, Tensile) Modulus, GPa 1050
57
Electrical Resistivity Order of Magnitude, 10x Ω-m 13
9.0
Specific Heat Capacity, J/kg-K 500
120
Stiffness to Weight: Axial, points 170
3.3
Stiffness to Weight: Bending, points 96
13
Thermal Conductivity, W/m-K 1900
1.1
Thermal Diffusivity, mm2/s 1080
0.95
Thermal Expansion, µm/m-K 1.0
6.0