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

doi:10.1016/j.actamat.2015.06.058

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

Department of Energy Conversion and Storage

Imperial College London

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The magnetocaloric performance of La_0.67Ca_0.27Sr_0.06Mn_1.05O₃ 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 La_0.67Ca_0.33MnO₃ 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 language	English
Journal	Acta Materialia
Volume	97
Pages (from-to)	413–418
ISSN	1359-6454
DOIs	https://doi.org/10.1016/j.actamat.2015.06.058
Publication status	Published - 2015

Keywords

Magnetocalorics
Active magnetic regenerators
SEM
XRD
Microstructuring
Nanostructuring

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10.1016/j.actamat.2015.06.058

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

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. {\textcopyright} 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.",

keywords = "Magnetocalorics, Active magnetic regenerators, SEM, XRD, Microstructuring, Nanostructuring",

author = "J.A. Turcaud and {Neves Bez}, Henrique and E. Ruiz-Trejo and Christian Bahl and Nielsen, {Kaspar Kirstein} and Anders Smith and L.F. Cohen",

year = "2015",

doi = "10.1016/j.actamat.2015.06.058",

language = "English",

volume = "97",

pages = "413–418",

journal = "Acta Materialia",

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T1 - Influence of manganite powder grain size and Ag-particle coating on the magnetocaloric effect and the active magnetic regenerator performance

AU - Turcaud, J.A.

AU - Neves Bez, Henrique

AU - Ruiz-Trejo, E.

AU - Bahl, Christian

AU - Nielsen, Kaspar Kirstein

AU - Smith, Anders

AU - Cohen, L.F.

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

KW - Magnetocalorics

KW - Active magnetic regenerators

KW - SEM

KW - XRD

KW - Microstructuring

KW - Nanostructuring

U2 - 10.1016/j.actamat.2015.06.058

DO - 10.1016/j.actamat.2015.06.058

M3 - Journal article

SN - 1359-6454

VL - 97

SP - 413

EP - 418

JO - Acta Materialia

JF - Acta Materialia

ER -

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

Abstract

Keywords

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