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Synthesis, dielectric properties, and influences oxygen vacancies have on electrical properties of Na1/2Bi1/2Cu3Ti4O12 ceramics prepared by a urea combustion method

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Abstract

The influences of oxygen vacancies on the dielectric and electrical properties of Na1/2Bi1/2Cu3Ti4O12 ceramics prepared using a urea combustion method were investigated via an annealing treatment in an O2 atmosphere. Interestingly, a single Na1/2Bi1/2Cu3Ti4O12 phase was successfully prepared using a low calcination temperature of 800 °C. High dielectric permittivity (ε′) and dense ceramic microstructure were achieved by sintering compacted powders at a low temperature of 980 °C. ε′ and the loss tangent (tanδ) were decreased by annealing in an O2 atmosphere. This was associated with the oxygen vacancy concentration at grain boundaries (GBs). A decrease in low-frequency tanδ was caused by enhancement of GB resistance, which was due to filling oxygen vacancies at GBs. A slight decrease in ε′ was attributed to the reduction in GB capacitance. Through use of an annealing process, the conduction activation energy at GBs was increased, whereas the conduction activation energy inside the grains remained unchanged. These results clearly indicated the effect of oxygen vacancy concentration at the GBs on the giant dielectric response and correlated GB response.

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Acknowledgments

This work was financially supported by the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission, through the Advanced Functional Materials Cluster of Khon Kaen University. This work was partially supported by the Integrated Nanotechnology Research Center (INRC), Khon Kaen University. W. Tuichai would like to thank the Thailand Graduate Institute of Science and Technology (TGIST) for his Master of Science Degree scholarship.

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Authors and Affiliations

  1. Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand

    Wattana Tuichai

  2. National Metal and Materials Technology Center, National Science and Technology Development Agency, 114 Thailand Science Park, Khlong Luang, Pathumthani, 12120, Thailand

    Supamas Danwittayakul & Teerapon Yamwong

  3. Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand

    Prasit Thongbai

  4. Integrated Nanotechnology Research Center (INRC), Khon Kaen University, Khon Kaen, 40002, Thailand

    Prasit Thongbai

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  1. Wattana Tuichai
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  2. Supamas Danwittayakul
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  3. Teerapon Yamwong
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  4. Prasit Thongbai
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Correspondence to Prasit Thongbai.

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Tuichai, W., Danwittayakul, S., Yamwong, T. et al. Synthesis, dielectric properties, and influences oxygen vacancies have on electrical properties of Na1/2Bi1/2Cu3Ti4O12 ceramics prepared by a urea combustion method. J Sol-Gel Sci Technol 76, 630–636 (2015). https://doi.org/10.1007/s10971-015-3814-1

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  • DOI: https://doi.org/10.1007/s10971-015-3814-1

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