LaFe_(11.4)Si_(1.6)By(y=0、0.1、0.2、0.3、0.4和0.5)系列化合物,通过添加少量的B后,可以明显的缩短退火时间.晶格常数随着B含量的增加先减小后增大.该系列化合物的热滞很小,B的添加对其热滞几乎没有影响.在外加磁场变化为0～1.5T时,等温磁熵变的最大值从19.1J/(kg·K)(y=0)逐渐下降到7.1J/(kg·K)(y=0.5).该系列化合物在B含量较低时,处于居里温度(T_c)之上,存在比较明显的场致变磁转变特性.随着B含量增加到0.5时,场致变磁转变特性明显减弱.
The annealing time of LaFe_(11.4)Si_(1.6)By(y=0,0.1,0.2,0.3,0.4 and 0.5) compounds can be reduced obviously by introducing interstitial atom B.The lattice parameter slightly decreased first and then increases with increasing B content.It can be seen that the small thermal hysteresis between heating and cooling curves for these compounds,but the thermal hysteresis is not affected by B addition.The maximal magnetic entropy change decreases from 19.1 to 7.1 J/(kg·K) by changing y from 0 to 0.5 for a magnetic field change from 0 to 1.5T.It is obvious that the itinerant electron metamagnetic (IEM) transition for low B content above the Curie temperature.The IEM transition disappears when y increase to 0.5.
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