Mössbauer and structural studies of Fe0.75Ni0.25-xCrx and Fe0.65Ni0.35-xCrx alloy systems

S. Nammas, I. A. Al-Omari, S. H. Mahmood

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

X-ray diffraction patterns for Fe0.75Ni0.25-xCrx show that the samples with x = 0 and 0.25 form a single bcc-type phase with a lattice parameter of 2.870 Å, while the samples with x = 0.05 and 0.10 form the bcc-type phase with an additional γ-fcc phase, as a minor phase with a lattice parameter of 3.585 Å. On the other hand all the Fe0.65Ni0.35-xCrx samples show a single γ-fcc phase. The lattice parameter for the Fe0.65Ni0.35-xCrx is found to increase linearly with increasing chromium concentration. Mössbauer spectra for Fe0.75Ni0.25-xCrx show that all the samples are magnetically ordered and some of them have a central paramagnetic line with a very low intensity (between 2 and 15%) for the samples with x = 0, 0.05, and 0.10. However, Mössbauer spectra for Fe0.65Ni0.35-xCrx show that the sample with x = 0 is magnetically ordered and the hyperfine field splitting starts to collapse at x = 0.05 and disappears completely at x = 0.10 and above. The average isomer shift of this system is negative and it decreases with increasing Cr concentration.

Original languageEnglish
Pages (from-to)53-59
Number of pages7
JournalJournal of Alloys and Compounds
Volume353
Issue number1-2
DOIs
Publication statusPublished - Apr 7 2003

Keywords

  • Hyperfine interactions
  • Magnetically ordered materials
  • Mössbauer spectroscopy
  • Transition metal alloys

ASJC Scopus subject areas

  • Metals and Alloys

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