Effect of Ni doped BaTiO₃ on the dielectric properties in the Ba(Ni_1/3Nb_2/3)_xTi_1−xO₃ solid solution

Faiza Boujelben (1) , F. Bahri (1) , Chokri Boudaya (1) , A. Maalej (1) , Hamadi Khemakhem (1) , Annie Simon (2) , Mario Maglione (2)

1 LMF - Laboratoire des Matériaux Ferroélectriques
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

New ferroelectric ceramics of ABO₃ perovskite type were synthesized in the Ba(Ni_1/3Nb_2/3)_xTi_1−xO₃ (0 ≤ x ≤ 0.2) system by solid state reaction technique. The effect of the replacement of titanium by nickel and niobium in the B site on structural and dielectric properties was investigated. For this, we have use X-ray diffraction and dielectric characterizations. Samples in cubic phase were generally obtained with a sintering temperature of 1350 °C. Dielectric measurements revealed that the very small change in composition by the substitution of titanium by nickel and niobium in the BaTiO₃ has a strong influence on the dielectric proprieties: fast decreasing of T_C or T_m (for BaTiO₃ T_C = 340 K, for x = 0.06, T_C = 270 K and for x = 0.16, T_m = 150 K). The evolution from classic ferroelectric behavior for (0 ≤ x < 0.1) to relaxor behavior for (0.1 ≤ x ≤ 0.2) is emphasized.

Mots clés: Dielectric; Ferroelectric; Perovskite; Ceramic

Domaines: Matériaux

Faiza Boujelben, F. Bahri, Chokri Boudaya, A. Maalej, Hamadi Khemakhem, et al.. Effect of Ni doped BaTiO₃ on the dielectric properties in the Ba(Ni_1/3Nb_2/3)_xTi_1−xO₃ solid solution. Journal of Alloys and Compounds, 2009, 481 (1-2), pp.559-562. ⟨10.1016/j.jallcom.2009.03.081⟩. ⟨hal-00408438⟩