Improvement in the magnetocaloric properties of sintered La(Fe,Si)13 based composites processed by La-Co grain boundary diffusion

X. C. Zhong; D. R. Peng; X. T. Dong; J. H. Huang; H. Zhang; D. L. Jiao; H. Zhang; Z. W. Liu; R. V. Ramanujan

doi:10.1016/j.jallcom.2018.11.395

Improvement in the magnetocaloric properties of sintered La(Fe,Si)₁₃ based composites processed by La-Co grain boundary diffusion

X. C. Zhong^*, D. R. Peng, X. T. Dong, J. H. Huang, H. Zhang, D. L. Jiao, H. Zhang, Z. W. Liu, R. V. Ramanujan

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

A novel method to combine hot pressing and grain boundary diffusion in order to fabricate La(Fe,Si)₁₃ based magnetocaloric composites is described. LaFe_11.6Si_1.4/La-Co magnetocaloric composites were prepared by hot-pressing, followed by diffusion annealing heat treatment. The Curie temperature (T_C) of these composites increases from 197 K to ∼235 K due to the diffusion of Co into the NaZn₁₃–type (1:13) majority phase. The maximum magnetic entropy change (–ΔS_M)^max at 2 T first increases with increasing diffusion time from 5.62 to 7.60 J/(kgˑK) and followed by a further increase up to 9.15 J/(kgˑK) due to the recombination of the 1:13 phase. The Co content of the La-Co binder could be used to tune the formation of the desired 1:13 phase.

Original language	English
Pages (from-to)	873-880
Number of pages	8
Journal	Journal of Alloys and Compounds
Volume	780
DOIs	https://doi.org/10.1016/j.jallcom.2018.11.395
Publication status	Published - Apr 5 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

ASJC Scopus Subject Areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Keywords

Grain boundary diffusion
Hot pressing
LaFeSi/La-Co composites
Magnetocaloric effect

Access to Document

10.1016/j.jallcom.2018.11.395

Cite this

@article{c53c93a5823640058afa2dfbafa3a436,

title = "Improvement in the magnetocaloric properties of sintered La(Fe,Si)13 based composites processed by La-Co grain boundary diffusion",

abstract = "A novel method to combine hot pressing and grain boundary diffusion in order to fabricate La(Fe,Si)13 based magnetocaloric composites is described. LaFe11.6Si1.4/La-Co magnetocaloric composites were prepared by hot-pressing, followed by diffusion annealing heat treatment. The Curie temperature (TC) of these composites increases from 197 K to ∼235 K due to the diffusion of Co into the NaZn13–type (1:13) majority phase. The maximum magnetic entropy change (–ΔSM)max at 2 T first increases with increasing diffusion time from 5.62 to 7.60 J/(kgˑK) and followed by a further increase up to 9.15 J/(kgˑK) due to the recombination of the 1:13 phase. The Co content of the La-Co binder could be used to tune the formation of the desired 1:13 phase.",

keywords = "Grain boundary diffusion, Hot pressing, LaFeSi/La-Co composites, Magnetocaloric effect",

author = "Zhong, {X. C.} and Peng, {D. R.} and Dong, {X. T.} and Huang, {J. H.} and H. Zhang and Jiao, {D. L.} and H. Zhang and Liu, {Z. W.} and Ramanujan, {R. V.}",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2019",

month = apr,

day = "5",

doi = "10.1016/j.jallcom.2018.11.395",

language = "English",

volume = "780",

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T1 - Improvement in the magnetocaloric properties of sintered La(Fe,Si)13 based composites processed by La-Co grain boundary diffusion

AU - Zhong, X. C.

AU - Peng, D. R.

AU - Dong, X. T.

AU - Huang, J. H.

AU - Zhang, H.

AU - Jiao, D. L.

AU - Zhang, H.

AU - Liu, Z. W.

AU - Ramanujan, R. V.

PY - 2019/4/5

Y1 - 2019/4/5

N2 - A novel method to combine hot pressing and grain boundary diffusion in order to fabricate La(Fe,Si)13 based magnetocaloric composites is described. LaFe11.6Si1.4/La-Co magnetocaloric composites were prepared by hot-pressing, followed by diffusion annealing heat treatment. The Curie temperature (TC) of these composites increases from 197 K to ∼235 K due to the diffusion of Co into the NaZn13–type (1:13) majority phase. The maximum magnetic entropy change (–ΔSM)max at 2 T first increases with increasing diffusion time from 5.62 to 7.60 J/(kgˑK) and followed by a further increase up to 9.15 J/(kgˑK) due to the recombination of the 1:13 phase. The Co content of the La-Co binder could be used to tune the formation of the desired 1:13 phase.

AB - A novel method to combine hot pressing and grain boundary diffusion in order to fabricate La(Fe,Si)13 based magnetocaloric composites is described. LaFe11.6Si1.4/La-Co magnetocaloric composites were prepared by hot-pressing, followed by diffusion annealing heat treatment. The Curie temperature (TC) of these composites increases from 197 K to ∼235 K due to the diffusion of Co into the NaZn13–type (1:13) majority phase. The maximum magnetic entropy change (–ΔSM)max at 2 T first increases with increasing diffusion time from 5.62 to 7.60 J/(kgˑK) and followed by a further increase up to 9.15 J/(kgˑK) due to the recombination of the 1:13 phase. The Co content of the La-Co binder could be used to tune the formation of the desired 1:13 phase.

KW - Grain boundary diffusion

KW - Hot pressing

KW - LaFeSi/La-Co composites

KW - Magnetocaloric effect

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