Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5457593 | Intermetallics | 2017 | 5 Pages |
Abstract
The structural transition temperature Tt increases largely with the introduction of Si in Mn0.9Cu0.1CoGe1-xSix alloys due to the enhancement of degree of hexagonal distortion. Thus, the first-order magnetostructural transformation from ferromagnetic orthorhombic to paramagnetic hexagonal phase can be obtained in the range of 0.15 < x < 0.21. Large magnetocaloric effect (MCE) under low magnetic field change of 2 T is obtained due to the magnetostructural transformation, e.g., the maximum magnetic entropy change (-ÎSM) value for x = 0.16 is 10.3 J/kg K at 297 K, which is comparable to or even larger than those of some typical room-temperature magnetocaloric materials. The nature of magnetostructural transition has been studied by different methods, and it is found that the Arrott plots fail to determine the order of phase transition. In contrast, the universal curve of ÎSM is proved to be a more effective criterion to distinguish the order of phase transition. Besides, a linear relationship between -ÎSM and Îμ0H is found, and so the -ÎSM values for higher field changes can be estimated by linear fitting. Consequently, large MCE induced by magnetostructural transformation suggests that Mn0.9Cu0.1CoGe1-xSix alloys could be promising candidates for room-temperature magnetocaloric materials.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Kun Tao, Hu Zhang, Ke Wen Long, Yi Xu Wang, Mei Ling Wu, Ya Ning Xiao, Cheng Fen Xing, Li Chen Wang, Yi Long,