Abstract
Magnetic refrigeration techniques based on the magnetocaloric effect (MCE) have recently been demonstrated as a promising alternative to conventional vapour-cycle refrigeration1. In a material displaying the MCE, the alignment of randomly oriented magnetic moments by an external magnetic field results in heating. This heat can then be removed from the MCE material to the ambient atmosphere by heat transfer. If the magnetic field is subsequently turned off, the magnetic moments randomize again, which leads to cooling of the material below the ambient temperature. Here we report the discovery of a large magnetic entropy change in MnFeP0.45As0.55, a material that has a Curie temperature of about 300 K and which allows magnetic refrigeration at room temperature. The magnetic entropy changes reach values of 14.5 J K-1 kg-1 and 18 J K-1 kg-1 for field changes of 2 T and 5 T, respectively. The so-called giant-MCE material Gd5Ge2Si2 (ref. 2) displays similar entropy changes, but can only be used below room temperature. The refrigerant capacity of our material is also significantly greater than that of Gd (ref. 3). The large entropy change is attributed to a field-induced first-order phase transition enhancing the effect of the applied magnetic field.
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References
Glanz, J. Making a bigger chill with magnets. Science 279, 2045 (1998).
Pecharsky, V. K. & Gschneidner, K. A. Jr Giant magnetocaloric effect in Gd5(Si2Ge2). Phys. Rev. Lett. 78, 4494–4497 (1997).
Gschneidner, K. A. Jr et al. Recent developments in magnetic refrigeration. Mater. Sci. Forum 315–317, 69–76 (1999).
Zimm, C. et al. Description and performance of a near-room temperature magnetic refrigerator. Adv. Cryogen. Eng. 43, 1759–1766 (1998).
Tishin, A. M. in Handbook of Magnetic Materials Vol. 12 (ed. Buschow, K. H. J.) 395–524 (North Holland, Amsterdam, 1999).
Choe, W. et al. Making and breaking covalent bonds across the magnetic transition in the giant magnetocaloric material Gd5(Si2Ge2). Phys. Rev. Lett. 84, 4617–4620 (2000).
Giguere, A. et al. Direct measurement of the “giant” adiabatic temperature change in Gd5(Si2Ge2). Phys. Rev. Lett. 83, 2262–2265 (1999).
Morellon, L. et al. Nature of the first-order antiferromagnetic-ferromagnetic transition in the Ge-rich magnetocaloric compounds Gd5(SixGe1–x)4. Phys. Rev. B 62, 1022–1026 (2000).
Pytlik, L. & Zieba, A. Magnetic phase diagram of MnAs. J. Magn. Magn. Mater. 51, 199–210 (1985).
Zach, R., Guillot, M. & Fruchart, R. The influence of high magnetic fields on the first order magneto-elastic transition in MnFe(P1-yAsy) systems. J. Magn. Magn. Mater. 89, 221–228 (1990).
Bacmann, M. et al. Magnetoelastic transition and antiferro-ferromagnetic ordering in the system MnFeP1-yAsy. J. Magn. Magn. Mater. 134, 59–67 (1994).
Beckman, O. & Lundgren, L. in Handbook of Magnetic Materials (ed. Buschow, K. H. J.) Vol. 6, 181–287 (North Holland, Amsterdam, 1991).
Acknowledgements
We thank A.J. Riemersma for preparation of graphs. Part of this work was performed within the scientific exchange program between the Netherlands and China. This work was financially supported by the Dutch Technology Foundation STW.
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Tegus, O., Brück, E., Buschow, K. et al. Transition-metal-based magnetic refrigerants for room-temperature applications. Nature 415, 150–152 (2002). https://doi.org/10.1038/415150a
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DOI: https://doi.org/10.1038/415150a
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