中文摘要：

将LaSi母合金和元素粉末混合,利用球磨工艺制备了La（Fe1-xCox）11.2Si1.8（x=0,0.02,0.04,0.06）样品。在1423 K的温度下烧结30min,然后放入水中快速冷却,就可以获得几乎为NaZn13型结构的单相化合物。磁性质的研究表明,样品的居里温度随着Co含量从x=0到x=0.06而提高,但是磁熵变减小。在01.5 T的外加磁场下,LaFe11.2Si1.8合金在其居里温度附近的最大磁熵变达到的6.5 J/kg,而x=0.06的样品的最大磁熵变约为2.1 J/（kg·K）。另外,球磨制备的样品还呈现了二级磁相变的特点,这对于磁热效应的应用非常有意义。

英文摘要：

The samples of （Fe1-x-Cox）11.2Si1.8（x=0, 0.02, 0.04, 0.06） were prepared by ball-milling with elemental powder and La Si cast master alloys. After sintering at 1423 K for 30 min followed by quenching in water, an almost NaZn13 type single phase was obtained. The study of magnetic properties reveals that the Curie temperature increases with Co content from x=0 to x=0.06 whereas the magnetic entropy change decreases. The alloy of LaFe11.2Si1.8 has a maximum magnetic entropy change △S m of 6.5 J/（kg·K） near its Curie temperature under a magnetic field of 01.5 T, while the maximum magnetic entropy change is about 2.1 J/（kg·K） with x=0.06. Furthermore, the magnetization of ball-milled samples exhibits a second-order magnetic transition, which is interesting for magnetocaloric applications.