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Electrical and Optical Properties of Nanocrystalline A8ZnNb6O24 (A = Ba, Sr, Ca, Mg) Ceramics

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Abstract

Nanoparticles of A8ZnNb6O24 (A = Ba, Sr, Ca, and Mg, abbreviated as BZN, SZN, CZN, and MZN) have been synthesized by an auto-igniting combustion technique and their structural and optical properties characterized. The phase purity, crystal structure, and particle size of the prepared nanopowders were examined by x-ray diffraction (XRD) analysis and transmission electron microscopy. The XRD results revealed that all the samples crystallized with hexagonal perovskite structure in space group P6 3 cm. The Fourier-transform infrared and Raman (FT–Raman) spectra of the samples were investigated in detail. The ultraviolet–visible (UV–Vis) absorption spectra of the samples were also recorded and their optical bandgap energy values calculated. The nanopowders synthesized by the combustion technique were sintered to 95% of theoretical density at temperature of 1250°C for 2 h. The surface morphology of the sintered pellets was studied by scanning electron microscopy. The photoluminescence spectra of the samples showed intense emission in the blue–green region. Complex impedance analysis was used to determine the grain and grain boundary effects on the dielectric behavior of the ceramics.

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Acknowledgements

The authors acknowledge the Kerala State Council for Science, Technology, and Environment, Government of Kerala for financial assistance.

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Authors and Affiliations

  1. Department of Physics, St Gregorios College, Kottarakara, 691531, India

    Fergy John

  2. Department of Physics, Mar Ivanios College, Thiruvananthapuram, 695015, India

    Fergy John, Jijimon K. Thomas, John Jacob & Sam Solomon

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  1. Fergy John
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  2. Jijimon K. Thomas
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Correspondence to Sam Solomon.

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John, F., Thomas, J.K., Jacob, J. et al. Electrical and Optical Properties of Nanocrystalline A8ZnNb6O24 (A = Ba, Sr, Ca, Mg) Ceramics. J. Electron. Mater. 46, 5183–5192 (2017). https://doi.org/10.1007/s11664-017-5536-3

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