Electrical conductivity and structure of CaO-stabilized zirconia doped with copper and iron |
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| Authors: | M Hartmanová Ľ Machovič A Koller F Hanic B Mišánik |
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| Institution: | Institute of Physics, Electro-Physical Research Centre of the Slovak Academy of Sciences, 84228 Bratislava, Czechoslovakia;Department of Physics, Faculty of Engineering, Slovak Technical University, 81231 Bratislava, Czechoslovakia;Research Institute of Electrotechnic Ceramics, 50064 Hradec Králové, Czechoslovakia;Institute of Inorganic Chemistry, Chemical Research Centre of the Slovak Academy of Sciences, 84236 Bratislava, Czechoslovakia;Computer Centre of the Slovak Academy of Sciences, 84235 Bratislava, Czechoslovakia |
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| Abstract: | The investigation of the influence of copper and iron oxides on the electrical conductivity, the lattice defects and the structure of calcia-stabilized zirconia has shown that (i) the influence of copper is negligible due to the evaporation of this element at the sintering temperature as a consequence of its high volatility; (ii) the presence of iron in the sample prevents sintering of the calcia-stabilized zirconia; (iii) the addition of iron causes decomposition of the cubic solid solution CaxZr1?xO2?x into monoclinic ZrO2, the vacant phase Ca0.1Zr0.9O1.9, calcium ferrite and iron oxides; the solubility limit of iron oxide was found to be ≈1 mol%; (iv) the calcia-stabilized zirconia doped with iron is a mixed conductor at low temperatures; at high temperatures (>1073 K) it is a dominant ionic conductor. |
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