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Effects of Ti/Nb stoichiometry on the microstructure and dielectric responses of NaCu3Ti3−xNb1+xO12 ceramics

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Abstract

Different stoichiometry of Ti/Nb in NaCu3Ti3−xNb1+xO12 ceramics were prepared by solid state synthesis. Microstructure and dielectric properties of NaCu3Ti3−xNb1+xO12 ceramics were investigated. The mean grain size decreases with increasing Nb content. Dielectric constant (ε′) and dielectric loss (tanδ) are changed dramatically with different stoichiometry of Ti/Nb. Two relaxation processes were identified for all the samples, one at low frequency region (<1 kHz) and the other one at 0.1 MHz region. Peaks of tanδ depressed and shifted to higher frequency as Nb content increased. Impedance spectroscopy analysis reveals that NaCu3Ti3−xNb1+xO12 ceramics are electrically heterogeneous, consisting of semiconducting grains and insulating grain boundaries.

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Authors and Affiliations

  1. Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, College of Materials Science and Engineering, Tianjin University, Tianjin, 300350, People’s Republic of China

    Yanyun Wang, Weibing Ma, Xiangrong Zang & Na Li

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  1. Yanyun Wang
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  2. Weibing Ma
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  3. Xiangrong Zang
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  4. Na Li
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Correspondence to Weibing Ma.

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Wang, Y., Ma, W., Zang, X. et al. Effects of Ti/Nb stoichiometry on the microstructure and dielectric responses of NaCu3Ti3−xNb1+xO12 ceramics. J Mater Sci: Mater Electron 28, 5323–5328 (2017). https://doi.org/10.1007/s10854-016-6190-x

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  • DOI: https://doi.org/10.1007/s10854-016-6190-x

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