Electronic excitation induced structural modification of FeCo nanoparticles embedded in silica matrix

Debalaya Sarker, S. Ghosh, D. Kabiraj, D. K. Avasthi, Antonella Iadecola, Sarathlal K. Vayalil, P. Srivastava

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Electronic excitation mediated energy loss by 120MeV Au9+ swift heavy ions (SHIs) results in significant structural modifications of FeCo nanoparticles embedded in thin SiO2 matrix. The variations in local atomic structure and particle size/shape at different irradiation fluences are probed by extended x-ray absorption fine structure spectroscopy (EXAFS) and grazing incidence small angle x-ray scattering (GISAXS). The crystallinity and ordering of the films are found to first decrease and then increase with fluence. The observed alterations in co-ordination number of Fe/Co from EXAFS are correlated primarily with particle size modifications due to a transient thermal spike generated in the embedded nanoparticles by SHIs. The role of hydrogen desorption from nanoparticles is also highlighted.

Original languageEnglish
Article number035017
JournalMaterials Research Express
Volume1
Issue number3
DOIs
Publication statusPublished - Sep 2014
Externally publishedYes

Keywords

  • Elongation
  • EXAFS
  • GISAXS
  • Swift heavy ion

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