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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MDPI AG
2021-10-01
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| 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 |
| collection | DOAJ |
| 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. |
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| spelling | doaj.art-8e42f3dc2af343b484916eff631c6d852023-11-23T00:22:53ZengMDPI AGMetals2075-47012021-10-011111174110.3390/met11111741Observation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd<sub>60</sub>Co<sub>40</sub> Amorphous AlloyPing Han0Ziyang Zhang1Jia Tan2Xue Zhang3Yafang Xu4Huiyan Zhang5Weihuo Li6China Energy Guoyuan Electric Power CO., LTD., Beijing 100033, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, ChinaTo 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.https://www.mdpi.com/2075-4701/11/11/1741partially crystallizedamorphous matrixmulti-phasebroadened magnetocaloric effect |
| spellingShingle | 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 Metals partially crystallized amorphous matrix multi-phase broadened magnetocaloric effect |
| title | 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_short | 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 |
| topic | partially crystallized amorphous matrix multi-phase broadened magnetocaloric effect |
| url | https://www.mdpi.com/2075-4701/11/11/1741 |
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