Structural and dielectrics properties of Pr3+ doped BaTi0.925(Yb0.5Nb0.5)(0.075)O-3 ceramics

C. Chalfouh (1) , A. Lahmar (2) , N. Abdelmoula (3) , H. Khemakhem (1)

1 Laboratoire Mat. Ferroelect.-Sfax
2 LPMC - Laboratoire de Physique de la Matière Condensée - UR UPJV 2081
3 Université de Sfax - University of Sfax

Ba1-xPr2x/3Ti0.925(Yb0.5Nb0.5)(0.075)O-3:(xPrBTYN) (0.02 <= x <= 0.08) ceramics were prepared by a high temperature solid-state reaction technique. The effects of the Pr3+ addition to structural and dielectric properties were examined. The X-ray study has evidenced a cubic single phase in the Pm-3m space group. Raman spectra showed that the replacement of the Ba2+ by Pr3+ ions induced a down shift of active modes accompanied with a significant reduction in the intensity. Further, a new mode appeared at 115 cm(-1) with an intensity depended on the composition. Dielectric study as a function of temperature and frequency of ceramic samples has revealed a normal ferroelectric behavior where x <= 0.06, instead to a relaxor character in the case of ceramic with an optimum value of Pr3+ doping (x = 0.08). (C) 2017 Elsevier B.V. All rights reserved.

Domaines: Matière Condensée [cond-mat]

C. Chalfouh, A. Lahmar, N. Abdelmoula, H. Khemakhem. Structural and dielectrics properties of Pr3+ doped BaTi0.925(Yb0.5Nb0.5)(0.075)O-3 ceramics. Journal of Alloys and Compounds, 2017, 729, pp.858-865. ⟨10.1016/j.jallcom.2017.09.208⟩. ⟨hal-03627744⟩