Mid-Temperature Synthesis of CeO2-TiO2 Complex Compound and Its XRD Structure Study
来源期刊：JOURNAL OF RARE EARTHS2003年第2期
论文作者：陈林深 吕光烈 胡秀荣
Key words：Semiconductor materials; sol-gel process; CeO2-TiO2 complex compound; XRD Rietveld analysis; rare earths;
Abstract: The CeTi2O6, which is formed above 1300 ℃ by ceramic method, was obtained at 700 ℃ using sol-gel synthesis method. XRD analysis shows that there is 8% deficient of Ce in the structure. The chemical formula is Ce0.92Ti2O5.84, which has a monoclinic structure with space group of C 2/m. Its cell parameters are a=0.9811(8) nm, b=0.3726(3) nm, c=0.6831(6) nm, and β=118.84°. After being treated at 1300 ℃ for 3 h, the system keeps stable but the deficient disappears, while the chemical formula change to the normal CeTi2O6, and the cell parameters are a=0.9813(3) nm, b=0.3752(4) nm, c=0.6883(5) nm, β=119.05°. The key to synthesis the precursors of CeTi2O6 is that Ti4+ and Ce3+ ions must reach the atomistic distributing state and prevent the oxidation of Ce3+ during sol-gel process.
陈林深1，吕光烈1，胡秀荣1
(1.Center of Measurement and Analysis, Zhejiang University, Hangzhou 310028, China)
Abstract:The CeTi2O6, which is formed above 1300 ℃ by ceramic method, was obtained at 700 ℃ using sol-gel synthesis method. XRD analysis shows that there is 8% deficient of Ce in the structure. The chemical formula is Ce0.92Ti2O5.84, which has a monoclinic structure with space group of C 2/m. Its cell parameters are a=0.9811(8) nm, b=0.3726(3) nm, c=0.6831(6) nm, and β=118.84°. After being treated at 1300 ℃ for 3 h, the system keeps stable but the deficient disappears, while the chemical formula change to the normal CeTi2O6, and the cell parameters are a=0.9813(3) nm, b=0.3752(4) nm, c=0.6883(5) nm, β=119.05°. The key to synthesis the precursors of CeTi2O6 is that Ti4+ and Ce3+ ions must reach the atomistic distributing state and prevent the oxidation of Ce3+ during sol-gel process.
Key words:Semiconductor materials; sol-gel process; CeO2-TiO2 complex compound; XRD Rietveld analysis; rare earths;
【全文内容正在添加中】
