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Title: From Waste-Heat Recovery to Refrigeration: Compositional Tuning of Magnetocaloric Mn1+xSb

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [3]; ORCiD logo [4]; ORCiD logo [1]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1615493
Grant/Contract Number:  
AC02-06CH11357; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 32; Journal Issue: 3; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Chemical structure; Magnetic properties; Magnetic materials; Physical and chemical processes; Transition metals

Citation Formats

Cooley, Joya A., Horton, Matthew K., Levin, Emily E., Lapidus, Saul H., Persson, Kristin A., and Seshadri, Ram. From Waste-Heat Recovery to Refrigeration: Compositional Tuning of Magnetocaloric Mn1+xSb. United States: N. p., 2020. Web. doi:10.1021/acs.chemmater.9b04643.
Cooley, Joya A., Horton, Matthew K., Levin, Emily E., Lapidus, Saul H., Persson, Kristin A., & Seshadri, Ram. From Waste-Heat Recovery to Refrigeration: Compositional Tuning of Magnetocaloric Mn1+xSb. United States. https://doi.org/10.1021/acs.chemmater.9b04643
Cooley, Joya A., Horton, Matthew K., Levin, Emily E., Lapidus, Saul H., Persson, Kristin A., and Seshadri, Ram. Wed . "From Waste-Heat Recovery to Refrigeration: Compositional Tuning of Magnetocaloric Mn1+xSb". United States. https://doi.org/10.1021/acs.chemmater.9b04643. https://www.osti.gov/servlets/purl/1615493.
@article{osti_1615493,
title = {From Waste-Heat Recovery to Refrigeration: Compositional Tuning of Magnetocaloric Mn1+xSb},
author = {Cooley, Joya A. and Horton, Matthew K. and Levin, Emily E. and Lapidus, Saul H. and Persson, Kristin A. and Seshadri, Ram},
abstractNote = {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.},
doi = {10.1021/acs.chemmater.9b04643},
journal = {Chemistry of Materials},
number = 3,
volume = 32,
place = {United States},
year = {Wed Jan 22 00:00:00 EST 2020},
month = {Wed Jan 22 00:00:00 EST 2020}
}

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