Reduced hysteresis in La0.7Ce0.3Fe11.5Si1.5 hydrides by grain size reduction
Magnetic cooling technology, based on the magnetocaloric effect (MCE), offers an energy-efficient and eco-friendly alternative to conventional gas compression, but is often hindered by large magnetic hysteresis, which limits cyclic performance. In this study, we show that the hysteresis of La0.7Ce0....
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Taylor & Francis Group
2025-12-01
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| Series: | Science and Technology of Advanced Materials |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/14686996.2025.2525742 |
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| author | Mitali Madhusmita Prusty Sri Harsha Molleti Hiroto Takanobu Sai Rama Krishna Malladi Xin Tang Hossein Sepehri-Amin |
| author_facet | Mitali Madhusmita Prusty Sri Harsha Molleti Hiroto Takanobu Sai Rama Krishna Malladi Xin Tang Hossein Sepehri-Amin |
| author_sort | Mitali Madhusmita Prusty |
| collection | DOAJ |
| description | Magnetic cooling technology, based on the magnetocaloric effect (MCE), offers an energy-efficient and eco-friendly alternative to conventional gas compression, but is often hindered by large magnetic hysteresis, which limits cyclic performance. In this study, we show that the hysteresis of La0.7Ce0.3(Fe,Si)₁₃ hydrides – a promising material for room-temperature refrigeration – can be significantly reduced by refining the microstructure of the precursor alloy. Substituting Ce for La in (La0.7Ce0.3)(Fe,Si)13Hx increases hysteresis losses from 12.3 J/kg to 34 J/kg. However, preparing the precursor alloy using the melt-spinning technique can almost eliminate this hysteresis. Lorentz transmission electron microscopy (Lorentz-TEM) shows that phase transition nucleation preferentially occurs at the grain boundaries. The hydrides prepared from melt-spun ribbons exhibit a much larger volume fraction of grain boundaries due to finer grains, providing a higher density of nucleation sites. This reduces the energy barrier for the phase transition and weakens the magneto-structural phase transition, as confirmed by in-situ X-ray diffraction patterns. Consequently, the reduced phase transition energy barrier leads to significantly lower hysteresis in melt-spun hydrides samples. These findings demonstrate the potential of microstructure engineering to reduce hysteresis in (La,Ce)(Fe,Si)13Hₓ materials for room-temperature magnetocaloric applications. |
| format | Article |
| id | doaj-art-2d77eddab27c4009a35e8fcc41d58aa0 |
| institution | DOAJ |
| issn | 1468-6996 1878-5514 |
| language | English |
| publishDate | 2025-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Science and Technology of Advanced Materials |
| spelling | doaj-art-2d77eddab27c4009a35e8fcc41d58aa02025-08-20T02:48:01ZengTaylor & Francis GroupScience and Technology of Advanced Materials1468-69961878-55142025-12-0126110.1080/14686996.2025.2525742Reduced hysteresis in La0.7Ce0.3Fe11.5Si1.5 hydrides by grain size reductionMitali Madhusmita Prusty0Sri Harsha Molleti1Hiroto Takanobu2Sai Rama Krishna Malladi3Xin Tang4Hossein Sepehri-Amin5Green Magnetic Material Group, Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science, Tsukuba, JapanGreen Magnetic Material Group, Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science, Tsukuba, JapanSurface and Bulk Analysis Unit, Research Network and Facility Services Division, National Institute for Materials Science, Tsukuba, JapanDepartment of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Sangareddy, IndiaGreen Magnetic Material Group, Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science, Tsukuba, JapanGreen Magnetic Material Group, Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science, Tsukuba, JapanMagnetic cooling technology, based on the magnetocaloric effect (MCE), offers an energy-efficient and eco-friendly alternative to conventional gas compression, but is often hindered by large magnetic hysteresis, which limits cyclic performance. In this study, we show that the hysteresis of La0.7Ce0.3(Fe,Si)₁₃ hydrides – a promising material for room-temperature refrigeration – can be significantly reduced by refining the microstructure of the precursor alloy. Substituting Ce for La in (La0.7Ce0.3)(Fe,Si)13Hx increases hysteresis losses from 12.3 J/kg to 34 J/kg. However, preparing the precursor alloy using the melt-spinning technique can almost eliminate this hysteresis. Lorentz transmission electron microscopy (Lorentz-TEM) shows that phase transition nucleation preferentially occurs at the grain boundaries. The hydrides prepared from melt-spun ribbons exhibit a much larger volume fraction of grain boundaries due to finer grains, providing a higher density of nucleation sites. This reduces the energy barrier for the phase transition and weakens the magneto-structural phase transition, as confirmed by in-situ X-ray diffraction patterns. Consequently, the reduced phase transition energy barrier leads to significantly lower hysteresis in melt-spun hydrides samples. These findings demonstrate the potential of microstructure engineering to reduce hysteresis in (La,Ce)(Fe,Si)13Hₓ materials for room-temperature magnetocaloric applications.https://www.tandfonline.com/doi/10.1080/14686996.2025.2525742Magnetocaloric materialsCe-substitutionmelt-spinningroom temperature magnetic refrigerationLa(Fe,Si)13 compound |
| spellingShingle | Mitali Madhusmita Prusty Sri Harsha Molleti Hiroto Takanobu Sai Rama Krishna Malladi Xin Tang Hossein Sepehri-Amin Reduced hysteresis in La0.7Ce0.3Fe11.5Si1.5 hydrides by grain size reduction Science and Technology of Advanced Materials Magnetocaloric materials Ce-substitution melt-spinning room temperature magnetic refrigeration La(Fe,Si)13 compound |
| title | Reduced hysteresis in La0.7Ce0.3Fe11.5Si1.5 hydrides by grain size reduction |
| title_full | Reduced hysteresis in La0.7Ce0.3Fe11.5Si1.5 hydrides by grain size reduction |
| title_fullStr | Reduced hysteresis in La0.7Ce0.3Fe11.5Si1.5 hydrides by grain size reduction |
| title_full_unstemmed | Reduced hysteresis in La0.7Ce0.3Fe11.5Si1.5 hydrides by grain size reduction |
| title_short | Reduced hysteresis in La0.7Ce0.3Fe11.5Si1.5 hydrides by grain size reduction |
| title_sort | reduced hysteresis in la0 7ce0 3fe11 5si1 5 hydrides by grain size reduction |
| topic | Magnetocaloric materials Ce-substitution melt-spinning room temperature magnetic refrigeration La(Fe,Si)13 compound |
| url | https://www.tandfonline.com/doi/10.1080/14686996.2025.2525742 |
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