Electrical conductivity and complex impedance analysis of La0.7-xNdxSr0.3Mn0.7Ti0.3O3 (x≤0.30) perovskite

Amel Abassi (1) , Nabil Kallel (1) , Sami Kallel (1) , Kamel Khirouni (2) , Octavio Peña (3)

1 Laboratoire Physico-Chimie des Matériaux [Monastir]
2 Laboratoire de Physique des Matériaux et des Nanomatériaux Appliquée à l’environnement
3 ISCR - Institut des Sciences Chimiques de Rennes

Polycrystalline samples La0.7-xNdxSr0.3Mn0.7Ti0.3O3 (x= 0.10; 0.20 and 0.30) were prepared by a high-temperature solide-state reaction technique. The X-ray diffraction shows that all the samples crystallize in the orthorhombic structure, Pbnm space group, with presence of a minor unreacted Nd2O3. The electrical response was studied by impedance complex spectroscopy over a broad frequency range (40-100 MHz) at room temperature. The values of ac conductivity for all samples were fitted by the Jonscher law σ ( ω ) = σ dc + A ω s . For x= 0.10 and 0.20, hopping occurs between neighboring sites, whereas for x=0.30 the hopping process occurs through longer distance. Complex impedance plots exhibit semicircular arcs described by an electrical equivalent circuit, which indicates that the Nd-doped compounds obey a non-Debye relaxation process

Keywords: Impedance spectroscopy; Perovskite; Relaxation phenomena; AC conductivity

Domains: Chemical Sciences

Amel Abassi, Nabil Kallel, Sami Kallel, Kamel Khirouni, Octavio Peña. Electrical conductivity and complex impedance analysis of La0.7-xNdxSr0.3Mn0.7Ti0.3O3 (x≤0.30) perovskite. Journal of Magnetism and Magnetic Materials, 2016, 401, pp.853-859. ⟨10.1016/j.jmmm.2015.10.115⟩. ⟨hal-01224516⟩