The Phase Structure of High Purity Rare Earth Oxide Coatings Used for Anti-Plasma Erosion

High-purity Y₂O₃ was widely used for anti-plasma erosion parts because of its excellent stability. Similarly, other rare earth oxides (M₂O₃), such as Gd₂O₃, Nd₂O₃, Yb₂O₃, La₂O₃, also exhibit excellent stability. Thus, high-purity yttrium oxide was doped with other rare earth oxides by sintering, including high purity Gd₂O₃, Nd₂O₃, Yb₂O₃, La₂O₃, and CeO₂. The mole ratio for each kind of doped powder was 4 for Y₂O₃ to 1 for the other rare earth oxide. The phase composition of the powders was examined by X-ray diffraction. Compared to the original M₂O₃ powders, the phase and crystal structure of the doped powders had some changes. The phase structure of the doped powders with Dy₂O₃, Gd₂O₃, Yb₂O₃, and CeO₂ were close to the sturcture of Y₂O₃, while the phase structure of the doped powder with La₂O₃ was close to LaYO₃. Whether the phase structure of the droped powder changed depends on the coaction of the atomic radius of the rare earth element and the original phase structure of the rare earth oxide. The stability of the doped powders was calculated by the first principle. The doped powders exhibited the same phase structure as Y₂O₃had the potential to use as the anti-erosion coating materials.