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Studies of dielectric and electrical properties of a new type of complex tungsten bronze electroceramics

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Abstract

A polycrystalline ceramic with a new type of complex tungsten-bronze type structure, having a general formula K2Ba2Nd2Ti4Nb4W2O30 has been prepared using a high temperature solid-state reaction route after optimizing the calcinations conditions on the basis of thermal analysis results. The material has been characterized by different experimental techniques. The formation of the compound has been confirmed using X-ray diffraction analysis. Dielectric properties (εr and tanδ) of the compound as a function of temperature at different frequencies have been carried out. Temperature dependence of dielectric constant indicates the presence of ferroelectric phase transition well above the room temperature. Complex impedance spectroscopic analysis has been carried out as a function of frequency at different temperatures to establish some correlation between the microstructure and electrical properties of the material. The nature of frequency dependence of ac conductivity obeys the Jonscher’s power law. The dc conductivity calculated from the ac conductivity spectrum shows the negative temperature coefficient of resistance behavior like a semiconductor.

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Acknowledgments

We are thankful to Prof. R. N. P. Choudhary, Prof. B. K. Samantaray and Prof. A. K. Thakur, Department of Physics, IIT Kharagpur, India for fruitful discussion.

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Authors and Affiliations

  1. Department of Physics, N.I.T., Rourkela, Orissa, 769 008, India

    Dillip K. Pradhan

  2. School of Physics, Sambalpur University, Jyoti Vihar, Burla, Orissa, 768 019, India

    Banarji Behera

  3. Department of Physics, ITER, S.O.A. University, Bhubaneswar, Orissa, 751 030, India

    Piyush R. Das

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  1. Dillip K. Pradhan
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  2. Banarji Behera
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  3. Piyush R. Das
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Correspondence to Dillip K. Pradhan.

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Pradhan, D.K., Behera, B. & Das, P.R. Studies of dielectric and electrical properties of a new type of complex tungsten bronze electroceramics. J Mater Sci: Mater Electron 23, 779–785 (2012). https://doi.org/10.1007/s10854-011-0492-9

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  • DOI: https://doi.org/10.1007/s10854-011-0492-9

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