Analyse of structural and electrical properties of NaBa((2-x))Nd-2x/3Nb5O15 solid solution with (0 < x <1)

M. Belarbi (1) , Manal Benyoussef (2) , Y. Tamraoui , B. Manoun (3) , A. Cantaluppi , D. Favry (4) , K. Taibi (5) , M. El Marssi (2) , A. Lahmar (2)

1 Université Abdelhamid Ibn Badis de Mostaganem
2 LPMC - Laboratoire de Physique de la Matière Condensée - UR UPJV 2081
3 Laboratoire de Chimie des Matériaux Solides
4 UPJV - Université de Picardie Jules Verne
5 LMSE - Laboratoire de Modélisation des Systèmes Energétiques

The structural and electrical properties of NaBa(2-x)Nd2x/3Nb5O15 ceramics were reported. All samples were prepared by the conventional solid-state reaction. A Room temperature X-ray study has allowed identifying the stabilization of tetragonal Tungsten Bronzes (TTB) structure with P4bm as space group for low Nd3+ concentration, whereas a centrosymmetric space group P4/mbm has been revealed for the high concentration. The dielectric study carried out on the prepared ceramics showed that the studied system undergo a behavior change from normal ferroelectric to a relaxor one with the increasing Neodymium amount. The complex impedance spectroscopy highlighted a thermally activated relaxation process in our samples. A short-range relaxation is proposed for x = 0.3 sample, while a possible coexistence of both localized and long-range relaxation for x = 1. Further, the Nyquist plot of the impedance is given for the low and higher Nd3+ samples and a simple model is proposed to fit the results.

Domaines: Matière Condensée [cond-mat]

M. Belarbi, Manal Benyoussef, Y. Tamraoui, B. Manoun, A. Cantaluppi, et al.. Analyse of structural and electrical properties of NaBa((2-x))Nd-2x/3Nb5O15 solid solution with (0 < x <1). Materials Chemistry and Physics, 2022, 277, ⟨10.1016/j.matchemphys.2021.125513⟩. ⟨hal-03608398⟩