Electrical conductivity of Nd and Ce co-doped Gd2Zr2O7 ceramics |
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Authors: | Z.-G. Liu Y. Zhou X.-L. Xia |
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Affiliation: | Department of Materials Science , Institute for Advanced Ceramics, Harbin Institute of Technology , No. 92, West Da-Zhi Street, Harbin 150001, P.R. China |
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Abstract: | In this study, (Gd1? x Nd x )2(Zr1? x Ce x )2O7 (0 ≤ x ≤ 0.5) ceramics have been prepared by pressureless sintering at 1973 K to investigate the influence of Nd and Ce co-doping on their electrical conductivity. The electrical conductivity of the ceramics was investigated by impedance spectroscopy measurements from 723 to 1173 K over the frequency range of 20 Hz to 2 MHz in air. The measured values obey the Arrhenius relation. For each composition, the grain conductivity gradually increases with increasing temperature from 723 to 1173 K. At a given temperature, it gradually decreases with increasing neodymium and cerium contents from x = 0 to 0.3; thereafter, the grain conductivity exhibits a slight increase with further increasing neodymium and cerium contents up to x = 0.5. |
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Keywords: | (Gd1? x Nd x )2(Zr1? x Ce x )2O7 impedance spectroscopy electrical conductivity ceramics |
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