ZHU Zhenfeng, ZHOU Yan,WANG Baoli

(School of Materials Science and Engineering, Shaanxi Univers ity of Science & Technology, Xianyang 712081)

Abstract: Pr- CeO₂ Nano- crys talline red pigments are prepared from cerium (Ⅲ) nitrate hexahydrate and praseodymium oxide by Low - temperature Combus tion Synthes is (LCS) combined with a Hydrothermal Method treatment. The pigments were characterized by XRD, SEM, EDS and XPS. The results show that the trivalent Pr enters CeO₂crys tal lattice and forms Pr-CeO₂ solid solution, which is based on the fluorite s tructure. It subs titutes trivalent Pr for tetravalent Ce in CeO₂ crys tal and is compensated by oxygen vacancies . Pr - CeO₂ pigments , with average grain s ize about 16.70 nm, prepared by this method have better crys tal s tructure and red tonality compared with LCS method alone.

Keywords: LCS, hydrothermal method, Pr- CeO₂, lanthanides pigments , Nano- crys talline