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: | , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/8e42f3dc2af343b484916eff631c6d85 |
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| Sumario: | 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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