Magnetic phase transition and room-temperature magnetocaloric effects in (Al,M)Fe2B2 (M = Si, Ga) compounds
| Autor: | Qiang Wang, Zhihao Zhang, Weibin Cui, Xiaoxiao Fu, Lu Zhang, Guiquan Yao, Peng Jia |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Phase transition Materials science Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials 0103 physical sciences Magnetic refrigeration Magnetic phase transition Curie temperature Single phase 0210 nano-technology |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 484:154-158 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2019.03.082 |
| Popis: | As the emerging ambient low-cost magnetic refrigeration system, the substitution effects on the magnetic properties and magnetocaloric effects in Al1−xSixFe2B2 (x = 0, 0.1, 0.2, 0.3) and Al1−yGayFe2B2 (y = 0.1 and 0.2) have been studied. The single phase is formed in a wide substitution composition region. All phase transitions in these compounds are of second-order and their Curie temperature (Tc) increases with more Si and Ga substitutions. For a field change of 5 T and 7 T, the maximum of entropy change (ΔSmax) of 4.9 J Kg−1 K−1 and 6.3 J Kg−1 K−1 are obtained and not dependent on the Si substitution amount in Al1−xSixFe2B2. As comparison, by Ga substitution, for the field change of 7 T and 5 T, the ΔSmax have been increased to 7.5 J Kg−1 K−1 and 6 J Kg−1 K−1 respectively. The tunable ambient Tc and considerable ΔSmax suggest that AlFe2B2-based compounds are potential low-cost ambient magnetic refrigeration candidates. |
| Databáze: | OpenAIRE |
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