J. Phys. IV France 7 (1997) C2-1015-C2-1016
Amorphous Fe Clusters Imbedded in fcc La for Melt-Quenched La-Fe AlloysM. Matsuura1, M. Sakurai2, K. Suzuki2, H. Adachi3 and H. Ino3
1 Miyagi National College of Technology, Natori Miyagi 981-12, Japan
2 Institute for Materials Research, Tohoku University, Sendai, 980, Japan
3 Faculty of Engineering, University of Tokyo, Bunkyo-ku Tokyo 113, Japan
Fluorecence XAFS measurements of the Fe K-edge are done for melt-quenched La-rich La-Fe alloys. XAFS results of the as-quenched samples of La92Fe8 and La88Fe12 show characteristic features of disordered structure. The results for La88Fe12 after annealed at 400°C for 30 min. show that Fe are precipitated to α-Fe in β-La. A strange phenomenon of finding the amorphous clusters in the crystalline phase can be attributed to the immiscible nature and large atomic size difference between Fe and La.
© EDP Sciences 1997