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Title: Material-based figure of merit for caloric materials

Efficient use of reversible thermal effects in magnetocaloric, electrocaloric, and elastocaloric materials is a promising avenue that can lead to a substantially increased efficiency of refrigeration and heat pumping devices, most importantly those used in household and commercial cooling applications near ambient temperature. A proliferation in caloric materials research has resulted in a wide array of materials where only the isothermal change in entropy in response to a handful of different field strengths over a limited range of temperatures has been evaluated and reported. Given the abundance of such data, there is a clear need for a simple and reliable figure of merit enabling fast screening and down-selection to justify further detailed characterization of those materials systems that hold the greatest promise. Based on the analysis of several well-known materials that exhibit vastly different magnetocaloric effects, the Temperature averaged Entropy Change (TEC) is introduced as a suitable early indicator of the material’s utility for magnetocaloric cooling applications, and its adoption by the caloric community is recommended.
Authors:
 [1] ; ORCiD logo [1] ;  [1] ;  [2]
  1. Ames Lab., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9531
Journal ID: ISSN 0021-8979; TRN: US1801225
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 3; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1417991
Alternate Identifier(s):
OSTI ID: 1417092

Griffith, L. D., Mudryk, Y., Slaughter, J., and Pecharsky, V. K.. Material-based figure of merit for caloric materials. United States: N. p., Web. doi:10.1063/1.5004173.
Griffith, L. D., Mudryk, Y., Slaughter, J., & Pecharsky, V. K.. Material-based figure of merit for caloric materials. United States. doi:10.1063/1.5004173.
Griffith, L. D., Mudryk, Y., Slaughter, J., and Pecharsky, V. K.. 2018. "Material-based figure of merit for caloric materials". United States. doi:10.1063/1.5004173.
@article{osti_1417991,
title = {Material-based figure of merit for caloric materials},
author = {Griffith, L. D. and Mudryk, Y. and Slaughter, J. and Pecharsky, V. K.},
abstractNote = {Efficient use of reversible thermal effects in magnetocaloric, electrocaloric, and elastocaloric materials is a promising avenue that can lead to a substantially increased efficiency of refrigeration and heat pumping devices, most importantly those used in household and commercial cooling applications near ambient temperature. A proliferation in caloric materials research has resulted in a wide array of materials where only the isothermal change in entropy in response to a handful of different field strengths over a limited range of temperatures has been evaluated and reported. Given the abundance of such data, there is a clear need for a simple and reliable figure of merit enabling fast screening and down-selection to justify further detailed characterization of those materials systems that hold the greatest promise. Based on the analysis of several well-known materials that exhibit vastly different magnetocaloric effects, the Temperature averaged Entropy Change (TEC) is introduced as a suitable early indicator of the material’s utility for magnetocaloric cooling applications, and its adoption by the caloric community is recommended.},
doi = {10.1063/1.5004173},
journal = {Journal of Applied Physics},
number = 3,
volume = 123,
place = {United States},
year = {2018},
month = {1}
}

Works referenced in this record:

Design and performance of a permanent-magnet rotary refrigerator
journal, December 2006

Giant Magnetocaloric Effect in Gd5(Si2Ge2)
journal, June 1997