Structures and magnetocaloric effects of Gd65−xRExFe20Al15 (x = 0–20; RE=Tb, Dy, Ho, and Er) ribbons
作者： Y. K. Fang , H. C. Chen , C. C. Hsieh , H. W. Chang , X. G. Zhao
DOI: 10.1063/1.3561447
关键词: Amorphous metal 、 Diffraction 、 Amorphous solid 、 Metallurgy 、 Magnetic refrigeration 、 Ribbon 、 Iron alloys 、 Crystallography 、 Materials science 、 Hexagonal crystal system
摘要: Gd-based Gd65−xRExFe20Al15 (x = 0–20, RE = Tb, Dy, Ho, and Er) alloys in ribbon form have been prepared by rapid quenching technology. It is found that the Gd65−xTbxFe20Al15 ribbons are amorphous state. However, for Gd65−xRExFe20Al15(RE = Dy, ribbons, addition to a diffuse diffraction band, peaks from hexagonal rare-earth-rich phases present indicating mixture of crystalline phases. This indicates heavier rare-earth elements (Dy, will decrease glass formability (RE = Dy, ribbons. The magnetic entropy changes these increase with increasing contents elements. maximal Gd45RE20Fe20Al15 (RE = Tb, located range 4.46–5.57 J/kg K under 50 kOe. Refrigerant capacity values obtained be about 580–720 J/kg These comparable or even higher than those bul...
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