Influence of micro- and nanoparticles of zirconium oxides on the dielectric properties of CaCu3Ti4O12 |
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| Affiliation: | 1. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, PR China;2. Laboratory of Chemical Analysis Elaboration and Materials, Engineering (LEACIM), Université de La Rochelle, Avenue Michel Crépeau, 17042 La Rochelle, Cedex 01, France;1. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China;2. Department of Technology and Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China;1. Department of Technology and Physics, Zhengzhou University of Light Industry, 5 Dongfeng Road, Zhengzhou 450002, China;2. Institute of High Energy Physics, Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China |
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| Abstract: | This work presents the results of Zr oxide doping of a CaCu3Ti4O12 (CCTO) ceramic prepared by a solid-state reaction. Different stoichiometries (ZrO and ZrO2) and grain sizes (micro- and nanoparticles) were added as dopants at concentrations of 0.5 and 1.0 wt%. Zr-doping controls the grain size growth, leading to a reduction of the grain size as observed by scanning electron microscopy. For both dopant concentrations, all of the samples exhibited lower dielectric loss and a smaller dielectric constant than those of undoped CCTO. The sample doped with 0.5% of the non-stoichiometric ZrO exhibits a dielectric constant over 3200 and a dissipation factor of 0.02 at 1 kHz. The impedance spectroscopy analysis confirms that the decrease of dielectric loss is mainly due to an increase in resistivity at grain boundaries, which is attributed to the suppression of oxygen-loss promoted by dopants. |
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| Keywords: | Dielectric ceramics Doped CCTO Impedance spectroscopy IBLC |
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