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Investigation of structural, optical, electrical, and magnetic properties of Fe‐doped La 0.7 Sr 0.3 MnO 3 manganites
Author(s) -
Hassan Abdullah Ameen Saad,
Khan Wasi,
Husain Shahid,
Dhiman Pooja,
Singh Mahavir
Publication year - 2020
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13540
Subject(s) - materials science , crystallite , analytical chemistry (journal) , nanocrystalline material , doping , ferromagnetism , magnetization , band gap , fourier transform infrared spectroscopy , electrical resistivity and conductivity , condensed matter physics , nanotechnology , optics , chemistry , magnetic field , physics , electrical engineering , optoelectronics , engineering , chromatography , quantum mechanics , metallurgy
In this work, the physical properties of nanocrystalline samples of La 0.7 Sr 0.3 Mn 1− x Fe x O 3 (0.0 ≤ x ≤ 0.20) perovskite manganites synthesized by the reverse micelle (RM) technique were explored in detail. The phase purity, crystal structure, and crystallite size of the samples were determined using X‐ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. All the samples had rhombohedral crystal structure and crystallite size increased with increase in Fe content in La 0.7 Sr 0.3 MnO 3 . The scanning electron micrographs (SEMs) exhibited smooth surface morphology and nonuniform shape of the particles. The optical properties studied using UV‐visible absorption spectroscopy revealed a decrease in the absorbance and optical band gap with an increase in Fe content in La 0.7 Sr 0.3 MnO 3 compound. The temperature‐dependent resistivity measurements revealed semiconducting nature of x = 0 and 0.1 samples up to the studied temperature range, while a metal‐to‐insulator transition was observed at higher Fe doping. Magnetic studies revealed weak ferromagnetism in all the samples and a reduction in the maximum magnetization with an increase in Fe content. A close correlation between electrical transport and magnetic properties was observed with the doping of Fe ion in La 0.7 Sr 0.3 MnO 3 at Mn site. These results advocate strong interactions associated with the double exchange mechanism among Fe 3+ and Mn 3+ ions.