| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Phase Structure and Electrical Conduction of CaTi1?xScxO3?δ Ceramics |
| ZHANG Qi-Long1**, LIU Yang2, YANG Hui1** |
1Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027
2Department of Materials Science and Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD, UK
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| Cite this article: |
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ZHANG Qi-Long, LIU Yang, YANG Hui 2013 Chin. Phys. Lett. 30 018102 |
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Abstract The electrical conduction of CaTi1?xScxO3?δ ceramics is investigated by ac impedance spectra. A complete solid solution is formed, in which Sc (x≤0.17) substitutes for a Ti-site with the creation of oxygen vacancies. The samples of x≤0.1 contain two main resistances, the bulk resistance R1 and the grain boundary resistance R2. However, only R1 and a low-frequency 'spike' representing charge build-up at the blocking metal electrodes are obtained for x≥0.15. CaTiO3 ceramics doped with Sc exhibits a relativly high electrical conductivity. With increasing x, both σ1 and σ2 of CaTi1?xScxO3?δ increase first, reach a maximum value at x=0.05, and then decrease to x≥0.1.
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Received: 16 October 2012
Published: 04 March 2013
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| PACS: |
81.05.-t
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(Specific materials: fabrication, treatment, testing, and analysis)
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77.84.-s
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(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
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