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Effect of excessive amount of (Na, K) ion ratio on structural, optical and electrical properties of K0.5Na0.5NbO3 ceramics prepared by solid-state route

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Abstract

Non-toxic lead-free potassium sodium niobate (K0.5Na0.5NbO3) ceramics were manufactured by using solid-state reaction method. The influences of excessive alkali metal (Na, K) ions concentration (0–20%) on their structural and electro-optical properties have been examined systematically. The structural properties confirmed the perovskite phase having orthorhombic crystal structure without any secondary phase even on the addition of excessive quantities of (Na, K) ions. Optical properties revealed decrease in optical bandgap energy with increase in the (Na, K) ions ratio. Photoluminescence spectrum shows the emission band in the UV–visible region, which makes KNN a suitable candidate for telecommunication devices, optical storage technology and LEDs. Impedance study revealed the negative temperature coefficient of resistance and non-Debye nature of the synthesized samples.

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Acknowledgements

Shammi Kumar is grateful to Dr Pankaj Sharma and Dr Ragini Raj Singh from JUIT Waknaghat, Solan, HP, for their support to record the optical and photoluminescence spectra of the material.

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Authors and Affiliations

  1. Department of Physics, Himachal Pradesh University, Shimla, 171005, India

    Shammi Kumar & Nagesh Thakur

  2. School of Physics, Shoolini University, Solan, 173229, India

    Mamta Shandilya & Gun anit Kaur

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  1. Shammi Kumar
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  2. Mamta Shandilya
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  4. Nagesh Thakur
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Correspondence to Shammi Kumar.

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Kumar, S., Shandilya, M., Kaur, G. et al. Effect of excessive amount of (Na, K) ion ratio on structural, optical and electrical properties of K0.5Na0.5NbO3 ceramics prepared by solid-state route. Bull Mater Sci 45, 30 (2022). https://doi.org/10.1007/s12034-021-02606-z

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