Effect of carbon substitution on the magnetic properties of Nd-Fe-(B,C) nanocomposite magnets

M. Daniil, H. Okumura, G. C. Hadjipanayis, D. J. Sellmyer

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The purpose of the present work is to study the effect of carbon substitution for boron on the magnetic and structural properties in nanocomposite Nd10Fe82B8-xCx, (x = 0, 2, 4, 5, 6, 7) ribbons in correlation with their crystallization behavior. Four different structural states were observed in as-spun ribbons depending on the carbon content x and the wheel speed: (i) Nd2Fe 14(B,C)+α-Fe, (ii) Nd2Fe14(B,C)+Nd 2Fe17Cx+α-Fe, (iii) Nd2Fe 17Cx+α-Fe and (iv) amorphous. In annealed ribbons, the 2:17:Cx phase transforms into the 2:14:1, whereas the amount of α-Fe phase increases with x. The coercivity has a maximum of 8.7kOe for x=2, followed by a gradual decrease with further increase of carbon concentration. The deterioration of the magnetic properties with x can be associated with the change in the crystallization behavior and the coarsening of the microstructure for x>4.

Original languageEnglish (US)
Pages (from-to)316-324
Number of pages9
JournalJournal of Magnetism and Magnetic Materials
Volume267
Issue number3
DOIs
StatePublished - Dec 2003

Keywords

  • Melt-spinning
  • Nanocomposite magnets
  • NdFeC magnets
  • Ribbons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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