Now showing 1 - 2 of 2
  • Publication
    Effect of sintering temperature of NBT–6BT lead-free ceramics on the structural, ferroelectric and piezoelectric properties
    (2022) ;
    O. Turki
    ;
    Z. Sassi
    ;
    H. Khemakhem
    ;
    N. Abdelmoula
    ;
    L. Lebrun
    The lead-free Na 0.5 Bi 0.5 0.94 Ba 0.06 TiO 3 (NBT-6BT) ceramics was fabricated at various sintering temperatures using a conventional solid-state reaction method. The effect of calcination temperature was systematically investigated on the structural properties. The XRD results show that the 850 °C is the best calcination temperature, where the NBT-6BT ceramic had the largest crystallite size with a dense sample, 96% of the theoretical value. However, the density decreased significantly with increasing the calcination temperature above 850 °C due to the secondary phase formation. On the other hand, the effect of sintering temperature was studied on the piezoelectric and ferroelectric properties evolutions. It is found that the optimal ferroelectric and piezoelectric values were obtained at 1150 °C (P r = 27 µC/cm 2 , E c = 3.89 kV/mm and d 33 = 110 pC/N). According to these results, we suggest that 850 °C and 1150 °C can be considered as optimal calcination and sintering temperature in NBT-6BT ceramic, respectively.
    Scopus© Citations 6  29  6
  • Publication
    Lanthanides effects on the ferroelectric and energy-storage properties of (Na0.5Bi0.5)0.94Ba0.06TiO3 ceramic: Comparative approach
    (2021) ;
    Turki, O.
    ;
    Abdelmoula, N.
    ;
    Seveyrat, L.
    ;
    Sassi, Z.
    ;
    Khemakhem, H.
    ;
    Lebrun, L.
    In this work, (Na0.5Bi0.5)0.94Ba0.06TiO3 ceramic doped with three lanthanides La3+, Gd3+, Ho3+ were prepared and investigated the corresponding structural, vibrational, ferroelectric and energy storage properties. The X-ray diffraction and Raman spectra reveal a pure perovskite with the coexistence of rhombohedral and tetragonal phases at room temperature for all samples. The thermal dependence of the dielectric constant shows a ferroelectric/ antiferroelectric phase transition around Td, confirmed by the change in the shape of P-E hysteresis loops for all samples. We found that the optimal piezoelectric and ferroelectric properties were obtained in the ceramic doped with Ho3+. Furthermore, the later sample revealed relatively remarkable features of energy storage density with temperature, reaching a maximum of 0.63 J/cm3 around 100 â—¦C. The results discussed in this work highlight the great potential of the doped NBT-6BT based lead-free ceramics.
      106  114