中文摘要：

系统研究了间隙原子H和Mn原子替代Fe对LaFe11.4Si1.6化合物磁性和磁熵变的影响。研究表明适量的Mn替代和间隙H原子的加入不改变化合物的立方NaZn13型晶体结构。La（Fe1-xMnx）11.4Si1.6居里温度TC从205K（x=0）下降到156K（x=0．04）。随Mn含量的进一步增加，Fe-Fe原子间的铁磁耦合与Fe-Mn、Mn-Mn原子间的反铁磁耦合作用相当，在x=0．06和0．08的化合物中引起阻挫产生自旋玻璃行为。吸氢后的所有化合物都呈现出良好的铁磁行为，由于晶胞体积膨胀居里温度升高到室温附近，并在室温附近观察到大磁热效应。

英文摘要：

The effects of interstitial atom H and the substitution of Mn for Fe in LaFela.4Sia.6 on the magnetic properties and magnetoclaoric effects are investigated in the present paper. A cubic NaZn13- type structure （Fm3c） remains in all the compounds. The Curie temperature decreases from 205K （x=0）to 156K （x=0.04）for La（Fe1-xMnx）11.4Si1.6 A spin glass behavior is found in La（Fe0.94Vln0.06）11.4Si1.6. La（Fe1-xMnx）11.4Si1.6 due to the competing interaction between the Fe-Fe ferromagnetic ordering and the Fe-Mn, Mn-Mn antiferromagnetic ordering. A typical ferromagnetic coupling is also found in all the hydrides. And the Curie temperature is enhanced to the room temperature due to a large expansion of the lattice parameters. A large magnetocaloric effect comparable with that of Gd is realized around the room temperature.