Magnetization and Electric Properties of Pr-doped ZnO |
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| Authors: | Naoki Ohashi Shun Mitarai Osamu Fukunaga Junzo Tanaka |
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| Affiliation: | 1.Department of Inorganic Materials, Faculty of Engineering,Tokyo Institute of Technology,Tokyo,Japan;2.Department of Inorganic Materials, Faculty of Engineering,Tokyo Institute of Technology,Tokyo,Japan;3.National Institute for Research in Inorganic Materials,Ibaraki,Japan |
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| Abstract: | Magnetic susceptibility of ZnO-varistors doped with Pr-ion was measured to elucidate the valence state of the Pr-ion and the effect of thermal treatment. Magnetic susceptibility χ(T) of the Pr-ion obeyed Curie-Weiss law, from which its valence state was estimated. The valence state of the Pr-ion varied with annealing condition of specimens, and it was indicated that the Pr-ion in ZnO ceramics was more reducible in comparison with pure \hboxPrOx ceramics. Nonlinear current-voltage characteristics was diminished with the reduction of the valence state of Pr ions. According to Auger electron spectra, the Pr-ions segregated at grain boundaries in ZnO ceramics. |
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