• 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

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    • 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



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

  • Bulletin of Materials Science | News

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