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    • Effect of excessive amount of (Na, K) ion ratio on structural, optical and electrical properties of K$_{0.5}$Na$_{0.5}$NbO$_3$ ceramics prepared by solid-state route

      SHAMMI KUMAR MAMTA SHANDILYA GUN ANIT KAUR NAGESH THAKUR

      Volume 45 Published: 3 February 2022 Article ID 0030

    • Fulltext

       

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      https://www.ias.ac.in/article/fulltext/boms/045/0030

    • Keywords

       

      XRD; TEM; optical bandgap; P–E loop; impedance spectroscopy.

    • Abstract

       

      Non-toxic lead-free potassium sodium niobate (K$_{0.5}$Na$_{0.5}$NbO$_3$) ceramics were manufactured by using solidstate 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.

    • Author Affiliations

       

      SHAMMI KUMAR1 MAMTA SHANDILYA2 GUN ANIT KAUR2 NAGESH THAKUR1

      1. Department of Physics, Himachal Pradesh University, Shimla 171005, India
      2. School of Physics, Shoolini University, Solan 173229, India

    • Dates

       
      Published
      3 February 2022
      Manuscript received
      24 May 2021
      Accepted
      30 September 2021
      Final version published online
      3 February 2022

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