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Title: Magnetocaloric properties of rare-earth substituted DyCrO{sub 3}

Recently, there has been a focus on the need for efficient refrigeration technology without the use of expensive or harmful working fluids, especially at temperatures below 30 K. Solid state refrigeration, based on the magnetocaloric effect, provides a possible solution to this problem. The rare-earth chromites (RCrO{sub 3}), especially DyCrO{sub 3}, with its large magnetic moment dysprosium ion, are potential candidates for such an application. The Dy{sup 3+} ordering transition at low temperatures (<10 K) likely causes a large magnetocaloric response in this material. This study investigates the possibility of tuning the magnetocaloric properties through the use of rare-earth substitution. Both Y{sup 3+} and Ho{sup 3+} substitutions were found to decrease the magnetocaloric response by disrupting the R{sup 3+} ordering. Whereas Er{sup 3+} substitution was found to increase the magnetocaloric response, likely due to an increase in the R{sup 3+} ordering temperature. The large magnetocaloric entropy change of Er{sup 3+} substituted DyCrO{sub 3} (10.92 J/kg K with a relative cooling power of 237 J/kg at 40 kOe and 5 K) indicates that this material system is well suited for low temperature (<30 K) solid state refrigeration applications.
Authors:
 [1] ;  [2] ;  [3]
  1. Material Science and Engineering Department, University of Connecticut, Storrs, Connecticut 06269 (United States)
  2. Institute of Material Science, University of Connecticut, Storrs, Connecticut 06269 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22494642
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHROMITES; DYSPROSIUM IONS; ENTROPY; ERBIUM IONS; HOLMIUM IONS; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; RARE EARTHS; REFRIGERATION; SOLIDS; TEMPERATURE RANGE 0065-0273 K; WORKING FLUIDS; YTTRIUM IONS