Abstract
The effects of Y3+ doping ions on ceramic microstructure, dielectric response, and electrical properties of Ca1−3x/2Y x Cu3Ti4O12 (x = 0, 0.05, 0.10, and 0.15) ceramics prepared by a modified sol–gel method were investigated. A grain size of Ca1−3x/2Y x Cu3Ti4O12 was reduced by Y3+ ions due to a solute drag effect. Substitution of CaCu3Ti4O12 ceramics with suitable Y3+ concentration of 5 at. % can improve dielectric properties with high-dielectric permittivity of ε′ ~ 1.37 × 104 and low tanδ ~ 0.05 at 1 kHz. The results revealed that the relationship of the mean grain size and ε′ cannot be formulated. Using impedance spectroscopy analysis, the grain boundary resistance (R gb) of Ca1−3x/2Y x Cu3Ti4O12 ceramics was found to be strongly enhanced by Y3+ doping ions with x = 0.05. With further increasing x from 0.05 to 0.15, R gb decreased. While the grain resistance tended to increase with increasing Y3+ concentration (x = 0–0.15). Variation of a low-frequency tanδ value in all Ca1−3x/2Y x Cu3Ti4O12 ceramics due to the influence of Y3+ substitution was well consistent with their changes in R gb values. Non-Ohmic properties of Ca1−3x/2Y x Cu3Ti4O12 ceramics were also investigated.
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Acknowledgments
This work is supported by the Thailand Research Fund (TRF) under the TRF Senior Research Scholar [Grant No. RTA5680008]. J. Boonlakhorn would like to thank the Faculty of Science, Khon Kaen University for his Master of Science Degree scholarship.
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Boonlakhorn, J., Kidkhunthod, P., Putasaeng, B. et al. Effects of Y doping ions on microstructure, dielectric response, and electrical properties of Ca1−3x/2Y x Cu3Ti4O12 ceramics. J Mater Sci: Mater Electron 26, 2329–2337 (2015). https://doi.org/10.1007/s10854-015-2688-x
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DOI: https://doi.org/10.1007/s10854-015-2688-x