Study of the structural relaxation in an amorphous Fe83B17 alloy by Moessbauer effect

The purpose of this study is to understand a mechanism of microscopic structural relaxation in amorphous alloys through Moessbauer spectra. The amorphous Fe83B17 alloys in ribbon form were fabricated by a rapid-quenching technique. The samples were annealed. The Moessbauer spectra have been measured at room temperature by a constant accelerating spectrometer. The internal field distribution P(H) was obtained. In order to see the effect of annealing on the internal field distribution, the difference before and after annealing was estimated. The mean value of internal field H, the peak ratio b of fundamental spectra between P2 and P3, and the logarithmic ratio of the areas of the spectra before and after annealing are shown in a figure. The results indicated that there were four different states, and a model for structural relaxation in amorphous alloys, based on the cluster model, was presented to interpret these four states. (Kato, T.)