Effect of Mn and Nb Doped BaTiO3 in the Dielectric Properties in the Ba(Mn1/2Nb1/2)xTi1−xO3

Faiza Boujelben (1) , Hamadi Khemakhem (1) , Annie Simon (2)

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

Polycrystalline samples of BaTi1−x (Mn0.5Nb0.5)x O3 with x = 0.025, 0.05, 0.075, 0.1, 0.125, 0.15, and 0.175 have been synthesized by the high-temperature solid-state reaction technique. The effects of cationic substitution of manganese and niobium for titanium at B sites of the BaTiO3 perovskite lattice on symmetry and dielectric properties were investigated. X-ray diffraction at room temperature and dielectric permittivity in the temperature range from 85 K to 500 K and frequency range from 100 Hz to 2 × 105 Hz were studied. The evolution from a normal ferroelectric to a relaxor ferroelectric is emphasized. T C or T m decreases when both manganese and niobium are introduced into the lattice of BaTiO3. High dielectric constant of around 9000 at T C = 280 K was found for Ba Ti0.925(Mn0.5Nb0.5)0.075O3 ceramic. A relaxor ferroelectric with ΔT m = 60 K and er¢ of about 3500 at 10 kHz with T m = 150 K was found for the BaTi0.85(Mn0.5Nb0.5)0.15O3 sample.

Mots clés: Ferroelectrics; X-ray diffraction; Dielectric response

Domaines: Matériaux

Faiza Boujelben, Hamadi Khemakhem, Annie Simon. Effect of Mn and Nb Doped BaTiO3 in the Dielectric Properties in the Ba(Mn1/2Nb1/2)xTi1−xO3. Journal of Electronic Materials, 2012, 41 (8), pp.2250-2255. ⟨10.1007/s11664-012-2027-4⟩. ⟨hal-00714515⟩