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Structural characterizations, dielectric properties and impedance spectroscopy analysis of Nd x Sr1-1.5x TiO3 ceramics

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Abstract

The Nd x Sr1–1.5x TiO3 ceramics (x = 0, 0.008, 0.024, 0.056, 0.104, 0.152 and 0.200) were prepared by solid state reaction method. X-ray diffraction (XRD) results indicated pure perovskite phase for all ceramics and the structure changed from cubic to tetragonal by increasing x value. Scanning electron microscopy (SEM) images showed high dense microstructure for all ceramics, and the grain size was strongly suppressed to ~1 μm for Nd x Sr1–1.5x TiO3 ceramics with x = 0.008, then gradually increased by further increasing x value and reached ~10 μm when x = 0.200. The relative dielectric constant ε r was strongly enhanced to 5,060 for the sample with x = 0.024, while its dielectric loss tanδ was still lower than 0.03. Together with its relatively high breakdown strength E b > 10 kV/mm, this ceramic should be a good candidate for high-voltage capacitor applications with enhanced energy storage densities. Impedance spectroscopy analysis revealed that the Nd x Sr1–1.5x TiO3 ceramics showed electrically heterogeneous, and the space charge polarization at interfaces should contribute to the observed high dielectric constant ε r.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Grant Nos. 51102121 and 51262011), Natural Science Foundation of Jiangxi Province of China (Grant No. 20114BAB216020) and Doctorate Foundation of Jingdezhen Ceramic Institute (Grant No. 006000345). The author (Z. Y. Shen) also would like to thank the support of China Scholarship Council.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic Institute, Jingdezhen, 333403, China

    Wen-Qin Luo, Zong-Yang Shen, Yue-Ming Li, Zhu-Mei Wang, Run-Hua Liao & Xing-Yong Gu

  2. Materials Research Institute, Pennsylvania State University, University Park, PA, 16802, USA

    Zong-Yang Shen

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  1. Wen-Qin Luo
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  2. Zong-Yang Shen
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Correspondence to Zong-Yang Shen.

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Luo, WQ., Shen, ZY., Li, YM. et al. Structural characterizations, dielectric properties and impedance spectroscopy analysis of Nd x Sr1-1.5x TiO3 ceramics. J Electroceram 31, 117–123 (2013). https://doi.org/10.1007/s10832-013-9805-0

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