Thang Nguyen Van, Dijk Niels Harmen van, Brück Ekkes
Fundamental Aspects of Materials and Energy, Department of Radiation Science and Technology, Delft University of Technology, Mekelweg 15, Delft 2629 JB, The Netherlands.
Materials (Basel). 2016 Dec 27;10(1):14. doi: 10.3390/ma10010014.
The influence of Co (Ni) and B co-doping on the structural, magnetic and magnetocaloric properties of (Mn,Fe) 2 (P,Si) compounds is investigated by X-ray diffraction (XRD), differential scanning calorimetry, magnetic and direct temperature change measurements. It is found that Co (Ni) and B co-doping is an effective approach to tune both the Curie temperature and the thermal hysteresis of (Mn,Fe) 2 (P,Si) materials without losing either the giant magnetocaloric effect or the positive effect of the B substitution on the mechanical stability. An increase in B concentration leads to a rapid decrease in thermal hysteresis, while an increase in the Co or Ni concentration hardly changes the thermal hysteresis of the (Mn,Fe) 2 (P,Si) compounds. However, the Curie temperature decreases slowly as a function of the Co or Ni content, while it increases dramatically for increasing B concentration. Hence, the co-substitution of Fe and P by Co (Ni) and B, respectively, offers a new control parameter to adjust the Curie temperature and reduce the thermal hysteresis of the (Mn,Fe) 2 (P,Si) materials.
通过X射线衍射（XRD）、差示扫描量热法、磁性测量和直接温度变化测量，研究了Co（Ni）和B共掺杂对（Mn，Fe）2（P，Si）化合物的结构、磁性和磁热性能的影响。结果发现，Co（Ni）和B共掺杂是一种有效调节（Mn，Fe）2（P，Si）材料居里温度和热滞的方法，同时不会损失巨磁热效应或B替代对机械稳定性的积极影响。B浓度的增加导致热滞迅速降低，而Co或Ni浓度的增加几乎不会改变（Mn，Fe）2（P，Si）化合物的热滞。然而，居里温度随Co或Ni含量的增加而缓慢降低，而随B浓度的增加而显著升高。因此，分别用Co（Ni）和B对Fe和P进行共替代，为调节（Mn，Fe）2（P，Si）材料的居里温度和降低热滞提供了一个新的控制参数。
