La(Fe,Si)13氢化物被认为是最具有应用前景的室温磁制冷工质之一,主动磁蓄冷样机上使用的理想磁制冷工质通常要求为片状块体.本工作在高达40 MPa的高压氢气气氛下烧结制备了片状 La0．9 Ce0．1 Fe11．7－x Mnx Si1．3(x＝0,0．29,0．35,0．41)氢化物块体.X射线衍射分析表明,片状氢化物由具有立方NaZn13结构的La(Fe,Si)13相及少量α-Fe相构成,其晶格常数比母合金明显增加.Mn 的掺杂有利于抑制烧结过程中α-Fe 的析出,并且使样品的居里温度降低至室温附近.在0~2 T的外磁场下,片状La0．9 Ce0．1 Fe11．35 Mn0．35 Si1．3氢化物块体的磁熵变ΔSm在289 K时达到最大值4．3 J/(kg.K).
La(Fe,Si)13 hydride is regarded one of the most promising room-temperature magnetic refrigerants.A typical active magnetic refrigerator machine requires thin plate-shaped refrigerants.In this work,La0.9 Ce0.1-Fe11.7-xMnxSi1.3(x=0,0.29,0.35,0.41)hydrides were prepared by sintering in a high-pressure H2 atmosphere of 40MPa.The X-ray diffraction analysis reveals that the plate-shaped La(Fe,Si)13 hydrides consist of NaZn13-type structure with a small amount ofα-Fe as impure phase,and that the lattice constants of NaZn13 phase remark-ably increase after hydrogenation.Meanwhile,Mn-doping is beneficial for restraining the precipitation ofα-Fe, and reduces the Curie temperature to around room temperature.La0.9 Ce0.1 Fe11.35 Mn0.35 Si1.3 thin plate-shaped hy-dride shows a magnetic-entropy changeΔSm of 4.3 J/(kg.K)for a field change of 2 T at 289 K.
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