Yttria vs. Hafnia

Both yttria and hafnia are oxide-based engineering ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is yttria and the bottom bar is hafnia.

Yttria (Yttrium Oxide, Y₂O₃)Hafnia (Hafnium Oxide, HfO₂)

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Material Properties

Density, g/cm³		5.0
Density, g/cm³		9.7

Elastic (Young's, Tensile) Modulus, GPa		120
Elastic (Young's, Tensile) Modulus, GPa		57

Maximum Temperature: Mechanical, °C		2000
Maximum Temperature: Mechanical, °C		2800

Melting Onset (Solidus), °C		2440
Melting Onset (Solidus), °C		2900

Specific Heat Capacity, J/kg-K		440
Specific Heat Capacity, J/kg-K		120

Stiffness to Weight: Axial, points		13
Stiffness to Weight: Axial, points		3.3

Stiffness to Weight: Bending, points		32
Stiffness to Weight: Bending, points		13

Thermal Conductivity, W/m-K		0.3
Thermal Conductivity, W/m-K		1.1

Thermal Diffusivity, mm²/s		0.14
Thermal Diffusivity, mm²/s		0.95

Thermal Expansion, µm/m-K		8.0
Thermal Expansion, µm/m-K		6.0

Yttria vs. Hafnia

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