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Microstructure evolution and dielectric properties of Ba5-xNa2xNb10O30 ceramics with different Ba–Na Ratios

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Abstract

The tetragonal tungsten bronzes of Ba5−xNa2x Nb10O30 (BNN, 0.5≤ x≤1.3) ceramics were synthesized using the solid state reaction method. The sintering behavior and dielectric characteristics of the BNN ceramics, as a function of the Ba-Na ratio, were examined. Densification of the samples with excess compositions of Ba and Na was higher than that of the stoichiometric BNN sample. The maximum dielectric constant and the Curie temperature showed highest values at the stoichiometric composition and decreased as the composition shifted away from the stoichiometry. in order to obtain a quantitative evaluation of the diffuse phase transition (DPT) behavior of the BNN ceramics, γ and C/κmax were calculated. The weakest DPT behavior was observed in the stoichiometric composition. An increase in the DPT is in correlation with the increase in the number of ways of cation distribution by the disordered occupation of Ba and Na and the vacancies in the A1 and A2 sites of the tungsten bronze structure.

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Acknowledgements

This work was supported by grants No. R01-2003-000-11606-0 from the Basic Research Program of the Korea Science and Engineering Foundation.

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Authors and Affiliations

  1. Department of Inorganic Materials Engineering Kyungpook, National University, Daegu, 702-701, Korea

    Myoung-Sup Kim, Joon-Hyung Lee, Jeong-Joo Kim & Sang-Hee Cho

  2. Department of Materials Science and Engineering, Yeungnam University, Gyeongsan, 712-749, Korea

    Hee Young Lee

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  1. Myoung-Sup Kim
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  2. Joon-Hyung Lee
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  3. Jeong-Joo Kim
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  4. Hee Young Lee
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  5. Sang-Hee Cho
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Correspondence to Jeong-Joo Kim.

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Kim, MS., Lee, JH., Kim, JJ. et al. Microstructure evolution and dielectric properties of Ba5-xNa2xNb10O30 ceramics with different Ba–Na Ratios. J Solid State Electrochem 10, 18–23 (2006). https://doi.org/10.1007/s10008-005-0647-9

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  • DOI: https://doi.org/10.1007/s10008-005-0647-9

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