Abstract
Through the optimization of process, a series of orthorhombic perovskite SmFe1−x Mn x O3 (x = 0, 0.05, 0.1, 0.15, 0.2, 0.25) nanoparticles were readily prepared by self-ignited sol–gel process. The Mn substitution effects on the structure, morphology and magnetic properties of SmFeO3 have been investigated in detail. Pure phase orthorhombic SmFeO3 is calcinated at 900 °C for 3 h. By the introduction of Mn3+, the synthesis temperature of orthorhombic perovskite-type SmFe1−x Mn x O3 particles has been lowered to be around 700 °C. At room temperature, weak ferromagnetic behavior is observed at SmFeO3 which is caused by its canted antiferromagnetic ordering. In the SmFe1−x Mn x O3 system for x ≤ 0.15, the weak ferromagnetic interactions are effectively enhanced with increasing Mn3+, showing increased magnetization and coercive field. However, for SmFe0.8Mn0.2O3 and SmFe0.75Mn0.25O3, the weak ferromagnetic couplings begin to decrease. SmFe0.85Mn0.15O3 displays the strongest ferromagnetic behavior. This peculiar behavior is ascribed to the complex magnetic interactions between Mn and Fe ions.
Graphical Abstract
A series of orthorhombic perovskite SmFe1−x Mn x O3 (0 ≤ x ≤ 0.25) nanopowders were readily prepared by self-ignited sol–gel process. The calcination temperature has been lowered to be around 700 °C by the introduction of Mn3+. SmFe0.85Mn0.15O3 displays the strongest ferromagnetic behavior. The tunability of the magnetic characteristics of SmFe1−x Mn x O3 is ascribed to the complex magnetic interactions between Mn and Fe ions.
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Acknowledgments
The authors would like to acknowledge the financial support provided by the National Natural Science Foundation of China (Nos. 51002097, 51342007, 51472263), the Science and Technology Commission of Shanghai Municipality (No. 15ZR1440600), Shanghai Education Commission (13ZZ134), and Shanghai council for the promotion of transformation of scientific and technological achievements (14CXY36).
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Li, W., Shen, H. & Xu, J. Manganese substitution effects in SmFeO3 nanoparticles fabricated by self-ignited sol–gel process. J Sol-Gel Sci Technol 76, 637–643 (2015). https://doi.org/10.1007/s10971-015-3815-0
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DOI: https://doi.org/10.1007/s10971-015-3815-0