Physical properties of new, lead free BaTi_1-x(Nb_0.5Yb_0.5)_xO₃ ceramics

Z. Abdelkafi (1) , Najmeddine Abdelmoula (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 lead free ceramics derived from the ferroelectric material BaTiO₃ by substituting Ti^{4 +} by Nb^{5 +} and Yb^{3 +}. The dielectric and ferroelectric properties were studied. The compositions BaTi_{1 - x}(Nb_0.5Yb_0.5)_xO₃ display a classical ferroelectric (0 ≤ x < 0.1) and relaxor ferroelectric behaviour (0.1 ≤ x ≤ 0.2). BaTi_0.9(Nb_0.5Yb_0.5)_0.1O₃ specimen present a relaxor behaviour at a temperature close to room with high permittivity (ε'_r = 9500 at 1 kHz), which opens the way for possible use of it for capacitor applications. The polarisation hysteresis loops were observed of relaxor BaTi_0.875(Nb_0.5Yb_0.5)_0.125O₃ specimen. The ceramic BaTi_0.9(Yb_0.5Nb_0.5)_0.1O₃ provides a piezoelectric constant d₃₁ of about 11.17 pC/N near room temperature.

Mots clés: Dielectric properties; Ferroelectric; Ytterbium; Relaxor; Piezoelectric

Domaines: Matériaux

Z. Abdelkafi, Najmeddine Abdelmoula, Hamadi Khemakhem, Annie Simon, Mario Maglione. Physical properties of new, lead free BaTi_1-x(Nb_0.5Yb_0.5)_xO₃ ceramics. Ferroelectrics, 2008, 371 (1), pp.48-55. ⟨10.1080/00150190802385101⟩. ⟨hal-00380288⟩