Open AccessMechanochemical Synthesis of Soft Ferromagnetic Perovskite Lanthanum Strontium Manganite (La0.6Sr0.4MnO3)
Author(s) -
Farid Hanna,
Peter Ibrahim,
Ahmed E. Hannora
Publication year - 2022
Publication title -
ecs journal of solid state science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.488
H-Index - 51
eISSN - 2162-8777
pISSN - 2162-8769
DOI - 10.1149/2162-8777/ac6a78
Subject(s) - materials science , manganite , lanthanum manganite , nanocrystalline material , ferromagnetism , magnetization , perovskite (structure) , magnetoresistance , analytical chemistry (journal) , crystallite , lanthanum , nuclear magnetic resonance , crystallography , condensed matter physics , magnetic field , nanotechnology , chemistry , metallurgy , inorganic chemistry , physics , electrode , quantum mechanics , chromatography , electrolyte
A nanocrystalline La0.6Sr0.4MnO3 sample with perovskite structure was successfully prepared by mechanochemical synthesis. Mechanical treatment for 10 hours followed by annealing at 1100°C results in the formation of single perovskite lanthanum strontium manganite phase with rhombohedral crystal structure and R3 ̅C symmetry. The heat-treated sample crystallite size, calculated from X-ray diffraction pattern, was about 84 nm. The scanning electron microscope images indicated a high degree of fine structure. The formation of single perovskite phase was confirmed by Fourier transform, infrared measurements. The magnetic measurements showed the soft ferromagnetic behavior of the obtained sample. The saturation magnetization was found to be lower than that expected from theoretical calculation for perfect ferromagnetic ordering and lowed than the saturation magnetization published for bulk sample. This was explained in the light of the core/shell model of manganite nanoparticles. The obtained sample was found to have a negative coefficient of magnetoresistance at room temperature of about (-3.5 %) with the application of 25 KOe magnetic field.