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Influence of NaNbO3 on the structural, optical and dielectric properties of 0.05(K0.5Bi0.5TiO3)–0.95(NaNbO3) composites ceramics

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Abstract

A new polycrystalline lead-free 0.05(K0.5Bi0.5TiO3)–0.95(NaNbO3) (KBT–NN) composites ceramics have been prepared by solid-state reaction method and their structural, optical, dielectric, ferroelectric and impedance properties are investigated. X-ray diffraction and Rietveld refinement data reveal that this composites ceramics possesses a perovskite-type orthorhombic structure after the diffusion of K0.5Bi0.5TiO3 into the NaNbO3. An appreciable change in its vibrational phonon modes of KBT on addition of NaNbO3 is exhibited in the material as observed from Fourier-transform infrared spectroscopy (FT-IR) spectrum. The optical band gap energy of the sample is determined from the diffused absorbance spectra to be 3.2 eV, which may be useful in photo-catalytic application. In the frequency range of 130–900 cm−1, different vibrational modes are observed from Raman spectrum. Field emission scanning electron microscopy (FE-SEM) images reveal a well-defined and homogeneous morphology. Polarization vs. electric field study confirms the ferroelectricity. Dielectric and complex impedance spectroscopic studies are performed over a wide range of frequency (i.e., 103–106 Hz) and temperature (30°–500 °C) and it is found that Jonscher’s power law is well applicable to the alternating current (ac) conductivity spectrum. The direct current (dc) conductivity of the material, which depends upon temperature, exhibits the decrease resistance with increase of temperature similar to that of semiconductors. The dc conductivity confirms that the conduction mechanism is influenced by oxygen vacancies.

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Acknowledgements

One of the authors H.S.Mohanty acknowledges the financial support from CSIR, India for the SRF fellowship. First author S.K. Mohanty acknowledge the help of Dr. P.K. Sahoo for extending experimental facilities in NISER, Bhubaneswar and UGC for sanctioning Study Leave under FDP programme.

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Authors and Affiliations

  1. Department of Physics, M.H.D. College, Chhatia, Jajpur, Odisha, India

    S. K. Mohanty

  2. Department of Physics & Astronomy, National Institute of Technology, Rourkela, Odisha, India

    Hari Sankar Mohanty

  3. School of Physics, Sambalpur University, Burla, Odisha, India

    Banarji Behera

  4. Silicon Institute of Technology, Silicon Hill, Patia, Bhubaneswar, Odisha, India

    Debi. P. Datta

  5. Department of Physics, School of Applied Science, CUTM, Bhubaneswar, Odisha, India

    S. Behera

  6. Department of Physics, Veer Surendra Sai University of Technology, Burla, Odisha, India

    S. K. Mohanty & Piyush R. Das

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Mohanty, S.K., Mohanty, H.S., Behera, B. et al. Influence of NaNbO3 on the structural, optical and dielectric properties of 0.05(K0.5Bi0.5TiO3)–0.95(NaNbO3) composites ceramics. J Mater Sci: Mater Electron 30, 5833–5844 (2019). https://doi.org/10.1007/s10854-019-00881-5

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