Effect of annealing treatment on the magnetic properties of mechanochemical synthesized La0.8Pb0.2MnO3 manganites |
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| Authors: | H Bahrami P Kameli H Salamati |
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| Institution: | 1. Instituto de Investigaciones en Materiales Unidad Morelia, Universidad Nacional Autónoma de Mexico, Antigua Carretera a Pátzcuaro No. 8701, Col. Ex Hacienda de San José de la Huerta, C.P. 58190, Morelia, Michoacán, Mexico;2. Facultad de Ciencias Físico Matemáticas, Universidad Michoacana de San Nicolas de Hidalgo, Av. Francisco J. Mojica S/N, Ciudad Universitaria, Morelia, Michoacán, Mexico;3. Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolas de Hidalgo, Av. Francisco J. Mojica S/N, Ciudad Universitaria, Morelia, Michoacán, Mexico;4. Facultad de Ingeniería Química, Universidad Michoacana de San Nicolas de Hidalgo, Av. Francisco J. Mojica S/N, Ciudad Universitaria, Morelia, Michoacán, Mexico;5. Centro de Investigaciones en Materiales Avanzados, S.C., Chihuahua, Chihuahua, Mexico;1. State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Luoshi Road 122#, Wuhan 430070, China;2. School of Physics and Technology, College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China;1. School of Physics and Electronics, And Institute of Super-microstructure and Ultrafast Process in Advanced Materials, Central South University, Changsha 410083, People''s Republic of China;2. College of Science, Hunan Institution of Engineering, Xiangtan 411104, People''s Republic of China;3. Powder Metallurgy Research Institute and State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, People''s Republic of China;1. Institute of Research and Development, Duy Tan University, K7/25 Quang Trung, Danang, Viet Nam;2. Department of Physics, Hue University''s College of Education, 34 Le Loi, Hue City, Viet Nam;3. Department of Energy Engineering and Physics, Amirkabir University of Technology, Tehran, Iran |
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| Abstract: | In this paper, we have investigated the effect of annealing on structural and magnetic properties of La0.8Pb0.2MnO3 (LPMO) polycrystalline samples. Mechanochemical procedure has been used to produce LPMO nanocrystalline samples from oxide precursors. From the AC susceptibility measurements we found that the magnitude of susceptibility increases and the paramagnetic–ferromagnetic (PM–FM) transition width decreases by annealing the ball milled powders. Also, reentrant spin glass (RSG) behavior has been found in high temperature annealed samples. It seems that, due to the evaporation of PbO in high temperature annealed samples, vacancies created in perovskite structure and portion of the Mn3+–O–Mn4+ network is broken. So the FM double-exchange interaction is weakened due to the magnetic dilution and the antiferromagnetc (AFM) phase fraction increases in high temperature annealed samples. The competition between FM double-exchange interaction and AFM super-exchange interaction produces spin frustration and is responsible for the occurrence of RSG. |
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