Influence of manganite powder grain size and Ag-particle coating on the magnetocaloric effect and the active magnetic regenerator performance

J.A. Turcaud, Henrique Neves Bez, E. Ruiz-Trejo, Christian Bahl, Kaspar Kirstein Nielsen, Anders Smith, L.F. Cohen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The magnetocaloric performance of La0.67Ca0.27Sr0.06Mn1.05O3 is investigated as a function of the powder grain size and also as a function of decoration of grains with highly conductive silver particulates as a coating layer. We demonstrate that the thermal and electrical conductivities can be significantly modified by the Ag-particle coating when the material is examined in sintered pellet form and we compare results with a second manganite composition La0.67Ca0.33MnO3 with significantly smaller grain size. However, we find that this microstructural engineering does not improve the performance of the active magnetic regenerator cycle using the silver decorated material in powder form. The regenerator performance is improved by the reduction of the powder grain size of the refrigerant which we attribute to improved thermal management due to increased surface to volume ratio. © 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalActa Materialia
Volume97
Pages (from-to)413–418
ISSN1359-6454
DOIs
Publication statusPublished - 2015

Keywords

  • Magnetocalorics
  • Active magnetic regenerators
  • SEM
  • XRD
  • Microstructuring
  • Nanostructuring

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