• Dielectric and ferroelectric properties evolution of ($1-x$)(Bi$_{0.5}$Na$_{0.5}$TiO$_3$)–$x$K$_{0.5}$Na$_{0.5}$NbO$_3$ piezoceramics

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      https://www.ias.ac.in/article/fulltext/boms/043/0282

    • Keywords

       

      Ferroelectrics; solid-state reaction; piezoelectrics; lead-free materials.

    • Abstract

       

      In this work, piezoceramics of ($1-x$)(Bi$_{0.5}$Na$_{0.5}$)TiO$_3$$–x$(K$_{0.5}$Na$_{0.5}$)NbO$_3$, ($1-x$)BNT$–x$KNN, in the compositional range 0.00 ≤ $x$ ≤ 0.07, were prepared by a mechanochemically activated solid-state method. The structural phase formation and microstructural, dielectric, and ferroelectric properties were studied. Although changes, in symmetry of the perovskite structure, were not detected with the composition (i.e., from a perspective of its intrinsic properties), the microstructural evolution was strongly dependent on the content of the KNN phase (i.e., based on its extrinsic properties). Specifically, KNN favoured the formation of a microstructure with cubic grains, typical morphology of the alkalineniobate ceramics. After KNN addition, both the maximum permittivity temperature and the long-range to short-range ordered transition temperature were reduced. Additionally, ferroelectric loops and strain deformation curves also reflect the long-range to short-range order evolution with KNN addition and temperature.

    • Author Affiliations

       

      A PRADO1 F RUBIO-MARCOS2 3 L RAMAJO1 M S CASTRO1

      1. Institute of Research in Materials Science and Technology (INTEMA), Av. Colo´n 10850, B7606BWV Mar del Plata, Argentina
      2. Electroceramic Department, Instituto de Cera´mica y Vidrio, CSIC, Kelsen 5, 28049 Madrid, Spain
      3. Escuela Polite´cnica Superior, Universidad Antonio de Nebrija, Pirineos 55, 28040 Madrid, Spain
    • Dates

       
  • Bulletin of Materials Science | News

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