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Yttria (Yttrium Oxide, Y2O3)

Yttria is an oxide-based engineering ceramic. It has a very low thermal conductivity among oxide-based engineering ceramics. In addition, it has a fairly low heat capacity and a fairly high density. The graph bars on the material properties cards below compare yttria 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.

Mechanical Properties

Compressive (Crushing) Strength

390 MPa 57 x 103 psi

Elastic (Young's, Tensile) Modulus

120 GPa 17 x 106 psi

Thermal Properties

Maximum Temperature: Mechanical

2000 °C 3630 °F

Melting Onset (Solidus)

2440 °C 4420 °F

Specific Heat Capacity

440 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

0.3 W/m-K 0.17 BTU/h-ft-°F

Thermal Expansion

8.0 µm/m-K

Otherwise Unclassified Properties

Density

5.0 g/cm3 310 lb/ft3

Light Transmission Range

0.3 to 12 µm

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

32 points

Thermal Diffusivity

0.14 m2/s

Followup Questions

Further Reading

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015