Modulation relaxor behaviour by chemical substitution in the system Ba1-xCaxTi1-y(Zn1/3Nb2/3)yO3

L. Khemakhem (1) , A. Maalej (2) , A. Kabadou (1) , A. Ben Salah (1) , Annie Simon (3) , Mario Maglione (3)

1 SME - Laboratoire de sciences des matériaux et de l’environnement [Université de Sfax]
2 Laboratoire des Matériaux Ferroélectriques
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

This paper reports the structural and dielectric properties of Ba1 - xCaxTi1 - y (Zn1/3Nb2/3)yO3 ceramics with y is fixed to 0.2 and x = 0.2 and 0.3. Single-phase solid solutions of the simples were determined by X-ray diffraction. For the solid solution, BaTi1 - y(Zn1/3Nb2/3)yO3, the evolution of dielectric behaviour from a sharp ferroelectric peak (for y < 0.075) and to ferroelectric relaxor (for 0.075 < y < 0.2) was observed with increasing of Zn and Nb concentration but in this case the temperature of the maximum of dielectric permittivity Tm and Δ Tm are lowers. To modulate this relaxor character we have substitute the Ba by Ca to increase Tm and Δ Tm.

Domaines: Matériaux

L. Khemakhem, A. Maalej, A. Kabadou, A. Ben Salah, Annie Simon, et al.. Modulation relaxor behaviour by chemical substitution in the system Ba1-xCaxTi1-y(Zn1/3Nb2/3)yO3. Ferroelectrics, 2008, 371 (1), pp.82-88. ⟨10.1080/00150190802394939⟩. ⟨hal-00348535⟩