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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/040/05/0925-0931

    • Keywords

       

      BCTZ; sintering; grain size; dielectric properties; piezoelectric properties.

    • Abstract

       

      We prepared a lead-free ceramic (Ba$_{0.85}$Ca$_{0.15}$)(Ti$_{1−x}$Zr$_x$ )O$_3$ (BCTZ) using the conventional mixed oxide technique. The samples were prepared by an ordinary mixing and sintering technique. In this study we investigated howsmall amounts of Zr$^{4+}$ can affect the crystal structure and microstructure as well as dielectric and piezoelectric propertiesof BaTiO$_3$. X-ray diffraction analysis results indicate that no secondary phase is formed in any of the BCTZ powders for$0 \leq x \leq 0.1$, suggesting that Zr$^{4+}$ diffuses into BaTiO$_3$ lattices to form a solid solution. Scanning electron microscopy micrographs revealed that the average grain size gradually increased with Zr$^{4+}$ content from 9.5 $\mu$m for $x = 0.02$ to 13.5 $\mu$m for $x = 0.1$; Curie temperature decreased due to the small tetragonality caused by Zr$^{4+}$ addition. Owing to the polymorphic phase transition from orthorhombic to tetragonal phase around room temperature, it was found that the composition $x = 0.09$ showed improved electrical properties and reached preferred values of $d_{33} = 148$ pC N$^{−1}$ and $K_p = 27$%.

    • Author Affiliations

       

      H MSOUNI1 2 A TACHAFINE3 M EL AATMANI1 D FASQUELLE3 J C CARRU3 M EL HAMMIOUI2 M RGUITI4 A ZEGZOUTI1 A OUTZOURHIT5 M DAOUD1

      1. Equipe Sciences des Matériaux Inorganiques et leurs Applications, Faculté des Sciences Semlalia, Université Cadi Ayyad, BP 2390 Marrakech, Marocco
      2. Laboratoire Réactivité des Matériaux et Optimisation des Procédés, Faculté des Sciences Semlalia, Université Cadi Ayyad, BP 2390 Marrakech, Marocco
      3. Unité de Dynamique et de Structure des Matériaux Moléculaires, Université du Littoral Côte d’Opale, BP 717, 62228 Calais, France
      4. Laboratoire des Matériaux Céramiques et Procédés Associés, Université de Valenciennes et du Hainaut-Cambrésis, 59600 Maubeuge, France
      5. Laboratoire de Physique du Solide et des Couches Minces, Faculté des Sciences Semlalia, Université Cadi Ayyad, BP 2390 Marrakech, Marocco
    • Dates

       

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