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Structural, dielectric and optical properties of sol–gel synthesized 0.55Ba(Zr0.2Ti0.8)O3–0.45(Ba0.7Ca0.3)TiO3 ceramic

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Abstract

Lead-free polycrystalline ceramic 0.55Ba(Zr0.2Ti0.8)O3–0.45(Ba0.7Ca0.3)TiO3 (0.55BZT–0.45BCT) was synthesized by sol–gel method and the dielectric, impedance and optical properties of this ceramic were studied. X-ray diffraction analysis revealed the formation of pure perovskite phase with the coexistence of tetragonal and rhombohedral structures. The high value of dielectric constant (~6,985) with low dielectric loss (~0.013) was obtained at room temperature. Bulk and grain boundary resistances were measured by impedance analysis, which revealed negative temperature coefficient of resistance behaviour in this ceramic. The estimated value of optical band gap was found to be ~3.16 eV, which is related to the presence of intermediate energy levels. Two emission bands one at ~365 nm (UV region) and another at ~465 nm (blue region) were observed in photoluminescence spectrum at room temperature.

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Acknowledgments

Authors would like to acknowledge the financial help from Council of Scientific and Industrial Research, New Delhi India under the research Grant No. 03(1272)/13/EMR-II dated 12.04.2013.

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Authors and Affiliations

  1. Smart Materials Research Laboratory, Department of Physics, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Jyoti Rani & K. L. Yadav

  2. Metallurgical and Materials Engineering Department, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Satya Prakash

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  1. Jyoti Rani
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Correspondence to Jyoti Rani.

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Rani, J., Yadav, K.L. & Prakash, S. Structural, dielectric and optical properties of sol–gel synthesized 0.55Ba(Zr0.2Ti0.8)O3–0.45(Ba0.7Ca0.3)TiO3 ceramic. Appl. Phys. A 117, 1131–1137 (2014). https://doi.org/10.1007/s00339-014-8482-4

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