title: Optical, electrical and magnetic properties of lanthanum strontium manganite La1-xSrxMnO3synthesized through the citrate combustion method.
abstract: Generally, strontium-doped lanthanum manganites (LSM) are materials connected ordinarily as cathodes in the solid oxide fuel cell (SOFC). In this study, the structural, optical, electrical and magnetic properties of La1-xSrxMnO3(x = 0.2, 0.5, 0.8) synthesized using an organic acid precursor strategy were investigated, based on using citric acid as a fuel. Evidently, the results disclosed that a pure single monoclinic LSM phase was obtained from the thermally treated precursors annealed at 1000 °C with an annealing time of 2 h. The microstructure of the formed sample relied on the Sr2+ion content. Moreover, a good optical transparency of 45-60% in a wide range of wavelengths between 800 and 1800 nm for all samples substituted by Sr2+ions was performed. The optical band gap energy was increased from 2.09 to 2.76 eV by increasing the Sr2+ion molar ratios. The trend in the calculated refractive index, the high frequency dielectric constant (εα) and the static dielectric constant (ε0) of all the produced samples can be linked to an increase in the Sr2+ion concentration. Moreover, the magnetic properties were enhanced with increasing Sr2+ion content.
authors.affiliation: Central Metallurgical Research & Development Institute, P.O. Box: 87, Helwan, Cairo, Egypt. ali_omar155@yahoo.com and Department of Inorganic Nonmetallic Materials, University of Science and Technology Beijing, Beijing 100083, China and Institut Européen des Membranes, IEM UMR-5635, Université de Montpellier, ENSCM, CNRS, Place Eugène Bataillon, 34095 Montpellier cedex 5, France.
authors.forename: Ali Omar
authors.identifier: http://orcid.org/0000-0002-6278-1266
authors.initials: AO
authors.lastname: Turky
authors.affiliation: Central Metallurgical Research & Development Institute, P.O. Box: 87, Helwan, Cairo, Egypt. ali_omar155@yahoo.com.
authors.forename: Mohamed Mohamed
authors.initials: MM
authors.lastname: Rashad
authors.affiliation: Faculty of Science, Chemistry department, Al-Azhar University, Nasar City, Egypt.
authors.forename: Ali Mostafa
authors.initials: AM
authors.lastname: Hassan
authors.affiliation: Faculty of Science, Chemistry department, Al-Azhar University, Nasar City, Egypt.
authors.forename: Elsayed M
authors.initials: EM
authors.lastname: Elnaggar
authors.affiliation: Institut Européen des Membranes, IEM UMR-5635, Université de Montpellier, ENSCM, CNRS, Place Eugène Bataillon, 34095 Montpellier cedex 5, France.
authors.forename: Mikhael
authors.identifier: http://orcid.org/0000-0002-2913-2846
authors.initials: M
authors.lastname: Bechelany