Observation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd<sub>60</sub>Co<sub>40</sub> Amorphous Alloy

Observation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd<sub>60</sub>Co<sub>40</sub> Amorphous Alloy

To investigate the effect of crystallization treatment on the structure and magnetocaloric effect of Gd<sub>60</sub>Co<sub>40</sub> amorphous alloy, the melt-spun ribbons were annealed at 513 K isothermally for 20, 40 and 60 min. The results indicate that, with increasing ann...

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Autores principales: Ping Han, Ziyang Zhang, Jia Tan, Xue Zhang, Yafang Xu, Huiyan Zhang, Weihuo Li
Formato: article
Lenguaje:EN
Publicado: MDPI AG 2021
Materias:
partially crystallized
amorphous matrix
multi-phase
broadened magnetocaloric effect
Mining engineering. Metallurgy
TN1-997
Acceso en línea:https://doaj.org/article/8e42f3dc2af343b484916eff631c6d85
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spelling oai:doaj.org-article:8e42f3dc2af343b484916eff631c6d852021-11-25T18:21:37ZObservation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd<sub>60</sub>Co<sub>40</sub> Amorphous Alloy10.3390/met111117412075-4701https://doaj.org/article/8e42f3dc2af343b484916eff631c6d852021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1741https://doaj.org/toc/2075-4701To investigate the effect of crystallization treatment on the structure and magnetocaloric effect of Gd<sub>60</sub>Co<sub>40</sub> amorphous alloy, the melt-spun ribbons were annealed at 513 K isothermally for 20, 40 and 60 min. The results indicate that, with increasing annealing time, the Gd<sub>4</sub>Co<sub>3</sub> (space group P6<sub>3</sub>/m) and Gd<sub>12</sub>Co<sub>7</sub> (space group P2<sub>1</sub>/c) phases precipitated from the amorphous precursor in sequence. In particular, in the samples annealed for 40 and 60 min, three successive magnetic transitions corresponding to the phases of Gd<sub>4</sub>Co<sub>3</sub>, Gd<sub>12</sub>Co<sub>7</sub> and remaining amorphous matrix were detected, which induced an overlapped broadened profile of magnetic entropy change (|Δ<i>S</i><sub>M</sub>|) versus temperature. Under magnetic field changing from 0 to 5 T, |Δ<i>S</i><sub>M</sub>| values of 6.65 ± 0.1 kg<sup>−1</sup>·K<sup>−1</sup> and 6.44 ± 0.1 J kg<sup>−1</sup>·K<sup>−1</sup> in the temperature spans of 180–196 K and 177–196 K were obtained in ribbons annealed for 40 and 60 min, respectively. Compared with the fully amorphous alloy, the enhanced relative cooling power and flattened magnetocaloric effect of partially crystallized composites making them more suitable for the Ericsson thermodynamic cycle.Ping HanZiyang ZhangJia TanXue ZhangYafang XuHuiyan ZhangWeihuo LiMDPI AGarticlepartially crystallizedamorphous matrixmulti-phasebroadened magnetocaloric effectMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1741, p 1741 (2021)
institution DOAJ
collection DOAJ
language EN
topic partially crystallized
amorphous matrix
multi-phase
broadened magnetocaloric effect
Mining engineering. Metallurgy
TN1-997
spellingShingle partially crystallized
amorphous matrix
multi-phase
broadened magnetocaloric effect
Mining engineering. Metallurgy
TN1-997
Ping Han
Ziyang Zhang
Jia Tan
Xue Zhang
Yafang Xu
Huiyan Zhang
Weihuo Li
Observation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd<sub>60</sub>Co<sub>40</sub> Amorphous Alloy
description To investigate the effect of crystallization treatment on the structure and magnetocaloric effect of Gd<sub>60</sub>Co<sub>40</sub> amorphous alloy, the melt-spun ribbons were annealed at 513 K isothermally for 20, 40 and 60 min. The results indicate that, with increasing annealing time, the Gd<sub>4</sub>Co<sub>3</sub> (space group P6<sub>3</sub>/m) and Gd<sub>12</sub>Co<sub>7</sub> (space group P2<sub>1</sub>/c) phases precipitated from the amorphous precursor in sequence. In particular, in the samples annealed for 40 and 60 min, three successive magnetic transitions corresponding to the phases of Gd<sub>4</sub>Co<sub>3</sub>, Gd<sub>12</sub>Co<sub>7</sub> and remaining amorphous matrix were detected, which induced an overlapped broadened profile of magnetic entropy change (|Δ<i>S</i><sub>M</sub>|) versus temperature. Under magnetic field changing from 0 to 5 T, |Δ<i>S</i><sub>M</sub>| values of 6.65 ± 0.1 kg<sup>−1</sup>·K<sup>−1</sup> and 6.44 ± 0.1 J kg<sup>−1</sup>·K<sup>−1</sup> in the temperature spans of 180–196 K and 177–196 K were obtained in ribbons annealed for 40 and 60 min, respectively. Compared with the fully amorphous alloy, the enhanced relative cooling power and flattened magnetocaloric effect of partially crystallized composites making them more suitable for the Ericsson thermodynamic cycle.
format article
author Ping Han
Ziyang Zhang
Jia Tan
Xue Zhang
Yafang Xu
Huiyan Zhang
Weihuo Li
author_facet Ping Han
Ziyang Zhang
Jia Tan
Xue Zhang
Yafang Xu
Huiyan Zhang
Weihuo Li
author_sort Ping Han
title Observation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd<sub>60</sub>Co<sub>40</sub> Amorphous Alloy
title_short Observation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd<sub>60</sub>Co<sub>40</sub> Amorphous Alloy
title_full Observation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd<sub>60</sub>Co<sub>40</sub> Amorphous Alloy
title_fullStr Observation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd<sub>60</sub>Co<sub>40</sub> Amorphous Alloy
title_full_unstemmed Observation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd<sub>60</sub>Co<sub>40</sub> Amorphous Alloy
title_sort observation of a broadened magnetocaloric effect in partially crystallized gd<sub>60</sub>co<sub>40</sub> amorphous alloy
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/8e42f3dc2af343b484916eff631c6d85
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