中文摘要：

主要研究掺杂了不同含量稀土La后的铁基非晶带材Fe73.5Cu1Nb3Si13.5B9非晶带材组织结构与软磁性能。结果表明,随着稀土La掺杂含量的增加,Fe73.5Cu1Nb3Si13.5B9非晶带材的Fe-Si相的析出温度下降,而Fe-B相的析出温度则升高,一方面,非晶的热稳定性下降,另一方面,有利于控制Fe73.5Cu1Nb3Si13.5B9非晶带材获得软磁Fe3Si相。非晶带材经过热处理晶化后,当非晶带材内掺杂稀土La的含量增加时,在测试频率在50Hz〈f〈1kHz内,非晶带材的Ls值下降,母材表现出优良的低频特性,但当频率在1kHz〈f〈500kHz内,非晶带材的Ls值显著上升,稀土La的掺杂有利于非晶带材的高频特性。含0.7%（质量分数）La的非晶带材综合软磁性能最佳。

英文摘要：

This paper discusses the structure and soft magnetic properties of La-doped Fe-based amorphous strips when the content of La is different.The results show that with the increasing of the weight ratios of La,the temperature of the precipitation of phase Fe-Si in the Fe73.5Cu1Nb3Si13.5B9 amorphous strips decreases,while the temperature of the precipitation of phase Fe-B increases;on one hand,the amorphous thermal stability goes down,on the other hand,phase Fe3Si can precipitate from the Fe73.5Cu1Nb3Si13.5B9 amorphous strips.After the La-doped Fe-based amorphous strips are annealed,when the weight ratio of La increase,the testing frequency f between 50Hz and 1kHz,the Ls values decrease which means that the based mental exhibited excellent low-frequency characteristics,while when the testing frequency are 1-500kHz,the Ls values significantly increase.La can improve high-frequency properties of the amorphous strip.The comprehensively soft magnetic properties of amorphous strips with the weight ratios of La 0.7wt% are the best