From Waste-Heat Recovery to Refrigeration: Compositional Tuning of Magnetocaloric Mn1+xSb
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[2];
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[1]
- Univ. of California, Santa Barbara, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Magnetic refrigeration, as well as waste-heat recovery, can be accomplished through the magnetocaloric effect, where temperature changes the magnetic state of a material or vice versa. Promising magnetocaloric materials display large changes in magnetic entropy (ΔSM) upon application of a moderate magnetic field and are often associated with magnetic materials possessing some degree of magnetostructural coupling. In such compounds, the magnetic transition is coupled to some structural transition at the ordering temperature, and indicators for these are readily calculated by the magnetic deformation proxy ΣM. MnSb, with a Curie temperature TC = 577 K, has a calculated magnetic deformation of ΣM = 5.9% and is a promising candidate material for waste-heat recovery. The temperature dependence of structural, magnetic, and magnetocaloric properties of Mn1+xSb, where $$x$$ is a tunable amount of interstitial Mn, is studied here. specifically, excess Mn is incorporated as an interstitial whose magnetic moment is antialigned with the stoichiometric Mn, and the excess Mn has the effect of lowering TC, such that the Curie temperature can be tuned from 577 K to nearly room temperature at 318 K for $$x$$ = 0.2. For $$x$$ = 0.0, 0.1, and 0.2, values of ΔSM under a maximum magnetic field $$H$$ = 5 T are found to be 3.65, 3.00, and 2.83 J K-1 kg-1, respectively. While the maximum ΔSM decreases with $$x$$, the high refrigerant capacity a more holistic measure of performance-is retained in this highly tunable system.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC02-06CH11357; AC02-05CH11231
- OSTI ID:
- 1615493
- Journal Information:
- Chemistry of Materials, Vol. 32, Issue 3; ISSN 0897-4756
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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