Study of Microstructural, Electrical and Dielectric Properties of La 0.9 Pb 0.1 MnO 3 and La 0.8 Y 0.1 Pb 0.1 MnO 3 Ceramics

S. A. Saleh
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S. A. Saleh: Physics Department, Faculty of Science, Sohag University, Sohag 82524, Egypt Physics Department, College of Science & Arts, Najran University, P. O. 1988 Najran, KSA.

Scientific Review, 2019, vol. 5, issue 2, 33-44

Abstract: The present work studies the microstructural and electrical properties of La0.9Pb0.1MnO3 and La0.8Y0.1Pb0.1MnO3 ceramics synthesized by solid-state route method. Microstructure and elemental analysis of both samples were carried out by field emission scanning electron microscope (FESEM) and energy dispersive spectroscopy (EDS) method, respectively. Phase analysis by X-ray diffraction (XRD) indicated formation of single phase distorted structure. The XRD data were further analyzed by Rietveld refinement technique. Raman analysis reveals that Y atom substitutes La site into the LPMO with shifting of phonon modes. The temperature variation of resistivity of undoped and Y-doped La0.9Pb0.1MnO3 samples have been investigated. The electrical resistivity as a function of temperature showed that all samples undergo an metal-insulator (M-I) transition having a peak at transition temperature TMI. Y-doping increases the resistivity and the metal-insulator transition temperature (TMI) shifts to lower temperature. The temperature-dependent resistivity for temperatures less than metal-insulator transition is explained in terms the quadratic temperature dependence and for T > TMI, thermally activated conduction (TAC) is appropriate. Variation of frequency dispersion in permittivity and loss pattern due to La-site substitution in LPMO was observed in the dielectric response curve.

Keywords: Ceramics; Microstructure; Raman Scattering; Electrical resistivity; Dielectric constants. (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:arp:srarsr:2019:p:33-44

DOI: 10.32861/sr.52.33.44

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