Mössbauer study of surface crystallization in metallic glasses

Radiation Effects in Amorphous Metallic Alloys as Revealed by Mössbauer Spectrometry: Part II. Ion Irradiation

“…Accounting for the short overview of the impact of irradiation by ions upon structural (and magnetic) modifications of Fe-based AMAs, it seems that it is inevitable to study them on an atomic level with a suitable local probe method. Here, we will demonstrate that 57 Fe Mössbauer spectrometry meets these requirements. We will discuss its feasibility using selected examples of AMAs that were exposed to irradiation with both light and heavy ions featuring different energies.…”

“…Mössbauer spectroscopy (MS) belongs to a few techniques that are able to scan local atomic arrangement of the investigated materials through hyperfine interactions between the nucleus and the electron shell of the resonant atoms [41]. A brief description of the most commonly used technique- 57 Fe experiments in transmission geometry-was provided in Part I of this paper [40]. Differences between Mössbauer spectra of crystalline and amorphous materials were also explained and so were the variations in the spectra belonging to non-magnetic and magnetic samples.…”

“…For example, Juraszek et al [23] observed changes in the magnetic texture of Fe 81 B 13.5 Si 3.5 C 2 alloys by 57 Fe transmission and conversion electron Mössbauer spectroscopy (CEMS) after the irradiation with swift Pb ions. The importance of CEMS in the investigation of the surfaces of ion-irradiated MGs was pointed out by Stichleutner et al [28] who investigated Sn-Co-Fe and Sn-Ni-Fe amorphous thin films after irradiation with 246 MeV Kr and 600 MeV Xe ions, respectively.…”

“…The importance of CEMS in the investigation of the surfaces of ion-irradiated MGs was pointed out by Stichleutner et al [28] who investigated Sn-Co-Fe and Sn-Ni-Fe amorphous thin films after irradiation with 246 MeV Kr and 600 MeV Xe ions, respectively. Modifications of SRO were reported using both 57 Fe and 119 Sn resonant nuclei.…”

Iron self-diffusion in nanocrystalline FeZr thin films

“…However the crystallization temperature of the amorphous film is significantly lower as compared to that of the melt-spun ribbon. This can be understood as follows: in the metallic glass ribbons it is generally seen that the surface crystallization takes place at a temperature significantly lower than the bulk crystallization temperature [28][29][30][31][32]. This has been attributed to several factors like, a higher free energy at the surface, additional nucleation sites due to impurities, ease of relief of stresses accompanying crystallization [26].…”