Lithiation of the Fe2P-based magnetocaloric materials
| Autor: | Ivan Batashev, N.H. van Dijk, Ekkes Brück, G.A. de Wijs |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Dopant Magnetic structure Magnetic refrigeration Magnetocaloric effect Thermodynamics chemistry.chemical_element Curie temperature Condensed Matter Physics Alkali metal FeP DFT Electronic Optical and Magnetic Materials First-principles calculations chemistry Phase (matter) Lithium Deformation (engineering) Theoretical Chemistry |
| Zdroj: | Journal of Magnetism and Magnetic Materials, 537, pp. 1-5 Journal of Magnetism and Magnetic Materials, 537 Journal of Magnetism and Magnetic Materials, 537, 1-5 |
| ISSN: | 0304-8853 |
| Popis: | The physical properties of the extensively studied Fe2P material family, well-known for its promising magnetocaloric qualities are greatly influenced by the unit-cell parameters of this hexagonal system. This sensitivity of the various magnetocaloric properties to structural parameters is particularly important for developing a material suitable for room-temperature magnetic refrigeration. A change in the unit cell, due to added elements can induce pronounced changes in the Curie temperature and the nature of the magnetic phase transition. Li belongs to a yet unexplored group of possible dopant elements – alkali metals, and exhibits an unusual behavior upon introduction to Fe2P. We observe a preference to replace iron atoms, as opposed to the common tendency of non-magnetic dopants to replace phosphorus, leading to a strong influence on the magnetic structure. The addition of Li introduces a deformation of the unit cell with a small change in volume and a decrease in c/a ratio, while the same crystallographic phase is maintained over a relatively wide concentration range. We show that lithium has an exceptionally strong effect on the Curie temperature of Fe2P reaching 800 K at 20% Li compared to 240 K for the undoped material. |
| Databáze: | OpenAIRE |
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