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Preparation process, microstructure and dielectric properties of Na0.5La0.5Cu3Ti4O12 ceramics by a sol–gel method

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Abstract

Effect of concentration, water content (molar ratio of the water and titanium) and pH value of the sol, and sintering temperatures and holding time on microstructure and dielectric properties of Na0.5La0.5Cu3Ti4O12 (NLCTO) ceramics by a sol–gel method were investigated in detail, respectively. It is found that the optimum concentration, the molar ratio of the water and titanium, and pH value of the sol were 1.00 mol/L, 11.0, and 0.3, respectively. The NLCTO ceramics sintered at 1,080 °C for 10 h exhibited more homogeneous microstructure, higher dielectric constant (about 1.1–1.8 × 104) and lower dielectric loss (about 0.051–0.064 at 1–10 kHz). The higher dielectric constant of the NLCTO ceramics might be due to the internal barrier layer capacitor effect. The NLCTO ceramics prepared by the sol–gel method showed two kinds of dielectric relaxation at higher temperature by electric modulus analysis, and two relaxation activation energy values were obtained.

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Acknowledgments

This work was supported by National Science Foundation of China (NSFC) (Grant Nos. 51172136 and 51107077) and Innovation Funds for graduate education (Grant No. 2012CXB011) and the Fundamental Research Funds for the Central Universities (Grant No. GK201102001, GK201101004, GK201101003). Open Fund of Shaanxi Province Key Laboratory (Program No. 2010SYS-07). Development Funds of Shaanxi Province Army-civilian Integration (Program No. 13JMR20).

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Authors and Affiliations

  1. Key Laboratory of Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an, 710062, Shaanxi, People’s Republic of China

    Zhanqing Liu, Xiaoliang Chao & Zupei Yang

  2. School of Chemistry and Life Sciences, Wei Nan Teachers University, Weinan, 714000, Shaanxi, People’s Republic of China

    Zhanqing Liu

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  1. Zhanqing Liu
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  2. Xiaoliang Chao
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  3. Zupei Yang
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Correspondence to Zupei Yang.

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Liu, Z., Chao, X. & Yang, Z. Preparation process, microstructure and dielectric properties of Na0.5La0.5Cu3Ti4O12 ceramics by a sol–gel method. J Mater Sci: Mater Electron 25, 2096–2103 (2014). https://doi.org/10.1007/s10854-014-1845-y

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  • DOI: https://doi.org/10.1007/s10854-014-1845-y

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