Yttria -Yttrium Oxide ( Y2O3 ) - Supplier Data by Goodfellow


Yttrium Oxide is mainly extracted from the mineral Xenotime (YPO4). Its properties include high thermal stability and good transparency to infrared radiation. It has an affinity for oxygen and sulphur and is used as an additive to stabilise Zirconia and as a sintering aid in Sialons and silicon nitride. As an optical ceramic, it transmits well in the infrared range, from 1 to 8 microns wavelength. The high infrared transmission, together with good resistance to erosion and thermal shock, makes it ideal for protection domes for infrared sensors.

Key Properties

The key properties of Yttrium Oxide are tabulated below.

Table 1. Key properties

Physical Properties




Density ( )


Thermal Properties


Coefficient of thermal expansion ( x10-6 K-1 )

8.1 @ 20-1000°C

Melting point ( °C )


Thermal conductivity ( W.m-1.K-1 )

8-12 @ 20°C

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