Magnetic, X-ray diffraction, and Mössbauer spectroscopy studies of Nd2Fe15Ga2Cx magnets

J. Shobaki, I. A. Al-Omari, M. K. Hasan, K. A. Azez, S. H. Mahmood, D. J. Sellmyer

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

X-ray diffraction patterns of Nd2Fe15Ga2Cx (0 ≤ x ≤ 2) show that all the alloys studied have the Th2Zn17 rhombohederal structure. The lattice parameters and the unit cell volume are found to increase linearly with increasing carbon concentration. Structural measurements on magnetically aligned powder samples show that the samples studied possess magnetic anisotropy with a basal easy axis. Magnetization measurements at 5K and at room temperature show that all samples under investigation are ferromagnetic, and the saturation magnetization increases with increasing x, reaching a maximum at x = 1, and then decreases slowly for larger values of x. Mössbauer spectra show that all the samples are magnetically ordered at room temperature and the average hyperfine field behaves similar to the saturation magnetization, where it reaches a maximum of 242 kOe for x = 1. The isomer shift is negative and it increases with increasing C concentration. The results are explained in terms of the volume expansion and the magnetovolume effects.

Original languageEnglish
Pages (from-to)173-177
Number of pages5
JournalPhysica B: Physics of Condensed Matter
Volume321
Issue number1-4
DOIs
Publication statusPublished - Aug 2002

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Keywords

  • Hyperfine field
  • Isomer shift
  • Lattice parameters
  • Mössbauer spectroscopy
  • Saturation magnetization

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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