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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:401

Article

Abassi, Amel¹  Kallel, Nabil¹  Kallel, Sami¹  Khirouni, Kamel²  Pena, Octavio³ 

[1] Univ Monastir, Lab Physicochim Mat, Dept Phys, Fac Sci Monastir, Monastir 5019, Tunisia

[2] Univ Gabes, Lab Phys Mat & Nanomat Appl Environm, Fac Sci Gabes Cite Erriadh, Gabes 6079, Tunisia

[3] Univ Rennes 1, Inst Sci Chim Rennes, UMR 6226, CNRS, F-35042 Rennes, France

关键词: Perovskite;    Ac conductivity;    Impedance spectroscopy;    Relaxation phenomena;   

DOI  :  10.1016/j.jmmm.2015.10.115

来源: Elsevier

【 摘 要 】

Polycrystalline samples La0.7 - xNdxSr0.3Mn0.7Ti0.3O3 (x=0.10; 0.20 and 0.30) were prepared by a high-temperature solid-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 sigma(omega) = sigma(dc) + A omega(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. (C) 2015 Elsevier B.V. All rights reserved.

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