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Influence of Co-doping on the Crystal Structure, Magnetocaloric Properties and Elastic Moduli of the La(Fe, Si)13 Compound

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TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings (TMS 2018)

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Abstract

The La(Fe, Si)13 compound shows a large magnetocaloric effect near room temperature. Partial substitution of Co for Fe can raise its Curie temperature and reduce the thermal hysteresis of its ferromagnetic transition. However, the influence of Co substitution on the crystal structure and magnetocaloric properties of La(Fe, Si)13 is not well understood yet. In this work, we report a comparative study of the crystal structure, magnetocaloric effects and elastic moduli of polycrystalline LaFe11.5Si1.5 and LaCoFe10.5Si1.5 samples using synchrotron radiation X-ray diffraction, magnetic measurements and resonant ultrasound spectroscopy. Compared to the Co-free sample, the Co-doped sample shows a sluggish ferromagnetic transition and reduced volumetric expansion as well as softer elastic moduli at room temperature. The Co-doped sample also shows stronger temperature dependence of Fe-Fe distances in its ferromagnetic state. Such differences between the samples are explained by considering the influence of Co doping on ferromagnetic interactions and lattice entropy.

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Acknowledgements

This work is financially supported by the National Basic Research Program of China (2012CB619405) and by the National Natural Science Foundation of China (50671024). David Mandrus and Jiaqiang Yan acknowledge support from the National Science Foundation under Grant No. DMR-1410428. The authors thank Michael Koehler for his help in the RUS measurements. Dan Huang and Ronghui Kou thank the China Scholarship Council for granting a CSC fellowship. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

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Authors and Affiliations

  1. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang, 110819, China

    Dan Huang, Ronghui Kou & Jianrong Gao

  2. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA

    Dan Huang, Amanda Haglund, Jiaqiang Yan, Veerle Keppens & David Mandrus

  3. Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA

    Ronghui Kou & Yang Ren

  4. Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    Jiaqiang Yan & David Mandrus

Authors
  1. Dan Huang
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  2. Ronghui Kou
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  3. Jianrong Gao
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  4. Amanda Haglund
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  5. Jiaqiang Yan
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  6. Veerle Keppens
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  7. David Mandrus
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  8. Yang Ren
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Corresponding author

Correspondence to Jianrong Gao .

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    The Minerals, Metals & Materials Society

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Huang, D. et al. (2018). Influence of Co-doping on the Crystal Structure, Magnetocaloric Properties and Elastic Moduli of the La(Fe, Si)13 Compound. In: & Materials Society, T. (eds) TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72526-0_17

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