2012 年 10 巻 p. 651-654
We investigated the local structure changes of Fe83.3Si4B8P4Cu0.7 nanocrystalline alloy prepared by arc melting with various annealing conditions by XAFS. It was found that individual structural changes occur around each element (Fe, Si, P, Cu) by several annealing steps. The as-spun sample shows amorphous like structure. The Fe and Si phase crystallize by annealing at first transition temperature (693 K). On the other hand the local structure around Cu and P atoms changed by two steps at 693 K and 823 K. In order to examine the structure more detail, the XANES comparison and the curve fitting method for EXAFS were performed. The Cu atoms were embedded in bcc Fe phase between the first and second transition temperatures and changes to fcc Cu phase over 823 K. It was suggested that α-Fe phase including the isolated Cu atoms can be easily crystallized and shows the high magnetic performance. [DOI: 10.1380/ejssnt.2012.651]
