Preparation of Nanocrystalline Rare Earth Mixed Oxides DyFexCo1-xO3-δ and Its Conductivity
来源期刊:JOURNAL OF RARE EARTHS2002年第5期
论文作者:刘二保 王建英 任引哲
Key words:rare earths; sol-gel method; DyFexCo1-xO3-δ; nanocrystalline; conductivity;
Abstract: Nanocrystalline rare earth mixed oxides DyFexCo1-xO3-δ were prepared by sol-gel method and characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG-DTA) and scanning electron microscope (SEM). The results show that DyFexCo1-xO3-δ has the structure of perovskite type at 800 ℃ for 2 h calcination. The conductivity of the materials at different temperature was measured by four-probe instrumentation and two-pole method. The results show that the conductivity of mixed oxides DyFexCo1-xO3-δ is higher than those of un-mixed oxides DyFeO3 and DyCoO3 and the conductivity is the best at x=0.8 in the matter of DyFexCo1-xO3-δ. The conductivity of these materials always increases with the temperature rising and there is an apparent change between 600 and 800 ℃. However, the spinodals are different with different ration of Fe3+ and Co3+. This kind of oxide is a conductive pottery material.
刘二保1,王建英1,任引哲1
(1.Department of Chemistry, Shanxi Normal University, Linfen 041004, China)
Abstract:Nanocrystalline rare earth mixed oxides DyFexCo1-xO3-δ were prepared by sol-gel method and characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG-DTA) and scanning electron microscope (SEM). The results show that DyFexCo1-xO3-δ has the structure of perovskite type at 800 ℃ for 2 h calcination. The conductivity of the materials at different temperature was measured by four-probe instrumentation and two-pole method. The results show that the conductivity of mixed oxides DyFexCo1-xO3-δ is higher than those of un-mixed oxides DyFeO3 and DyCoO3 and the conductivity is the best at x=0.8 in the matter of DyFexCo1-xO3-δ. The conductivity of these materials always increases with the temperature rising and there is an apparent change between 600 and 800 ℃. However, the spinodals are different with different ration of Fe3+ and Co3+. This kind of oxide is a conductive pottery material.
Key words:rare earths; sol-gel method; DyFexCo1-xO3-δ; nanocrystalline; conductivity;
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