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Effect of Mn Substitution on Microstructure Evolution and Magnetic Phase Transition in La(Fe1−x Mn x )10.8Co0.7Si1.5 Compounds

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Abstract

The influences of Mn substitution for Fe on microstructures of La(Fe1−x Mn x )10.8Co0.7Si1.5 (x = 0, 0.01, 0.02, 0.03) alloys in both the as-cast state and the annealed state have been studied. The results show that Mn substitution promotes the fining of the as-cast microstructure and increases the formation of 1:13 phase significantly when annealed. An almost single 1:13 phase is obtained for x = 0.01 when annealed at 1373 K (1100 °C) for 3 days, while a large amount of impurity phases is still present for x = 0. By increasing the amount of Mn to x = 0.02, a more purified annealed microstructure can be obtained. However, further substitution of Mn up to x = 0.03 is harmful for the formation of 1:13 phase. The Curie temperature T C of the annealed La(Fe1−x Mn x )10.8Co0.7Si1.5 (x = 0, 0.01, 0.02, 0.03) varies monotonously with Mn content x, decreasing from ~279 K (6 °C) for x = 0 to ~236 K (−37 °C) for x = 0.03. When x = 0.01, a higher maximum entropy change (−ΔS)max of 5.3 J/(kgK) and relative cooling power (RCP) of 166 J/kg can be obtained under a magnetic field of 2T. Further substitution of Mn (x = 0.02) results in a slight decrease of (−ΔS)max, whereas a larger RCP can still be kept.

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Acknowledgments

This work was supported by the National High Technology Research and Development Program of China (Grant No. 2011AA03A404).

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Song Sun (Graduate Student), Rongchang Ye (Associate Professor), Huaifeng Li (Graduate Student), Yanpo Zhang (Graduate Student), Yuanhang Jia (Graduate Student), Yunfei Wu (Graduate Student) & Yi Long (Graduate Student)

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  1. Song Sun
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  2. Rongchang Ye
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  3. Huaifeng Li
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Correspondence to Rongchang Ye.

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Manuscript submitted October 31, 2012.

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Sun, S., Ye, R., Li, H. et al. Effect of Mn Substitution on Microstructure Evolution and Magnetic Phase Transition in La(Fe1−x Mn x )10.8Co0.7Si1.5 Compounds. Metall Mater Trans A 44, 5782–5787 (2013). https://doi.org/10.1007/s11661-013-1925-2

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