ZHANG Xiaoting, ZHAO Senlong, WANG Huanping, CHEN Yaqian, YANG Qinghua, LEI Ruoshan, XU Shiqing
(College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China)

Abstract: The (Y₁-_xLa_x)₂O₃ submicron powders were prepared by the citrate method using Y(NO₃)₃•6H₂O, La(NO₃)₃•6H₂O, citric acid,ethanediol and deionized water as the raw materials, and the phase and morphology of the powders under different calcination temperature were discussed. The results showed that the addition of La₂O₃ can refine the powders of (Y₁-_xLa_x)₂O₃ , and the particles gradually become small with the increase of the solute content of La₂O₃ in (Y₁-_xLa_x)₂O₃ . The value of the solid solubility decreased with the increase of the calcination temperature, and the solid solubility was 0.3-0.4 and 0.2 as the calcination temperature was 1000 ℃ and 1400 ℃, respectively. The excessive La₂O₃ addition led to the emergence of the second phase of LaYO₃, which resulted in the abnormal powder particles growing up and the liquid phase at 1300 ℃. When the x value was between 0.1 and 0.2, the (Y₁-_xLa_x)₂O₃ submicron powders with diameter of 50-100 nm were acquired as the calcination temperature was 1100 ℃.

Key words: citrate method (Y₁-_xLa_x)₂O₃ ; phase; morphology; solid solubility