Elsevier

Physica B+C

Volume 130, Issues 1–3, May 1985, Pages 319-322
Physica B+C

Magnetic characteristics of R2Fe14B systems prepared with high purity rare earths (R =Y, Nd, Sm or Gd)

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Abstract

Commercially procured rare earth metals frequently contain 2–5 atomic per cent oxygen. Rare earth intermetallic compounds prepared from these materials with compositions estimated by synthesis can significantly deviate from the intended composition. Several R2Fe14B systems have been synthesized using rare earth metals obtained from the Ames Laboratory which typically contain <25 ppm oxygen (by weight) and their fun damental magnetic properties determined. Curie temperatures range from 565 (for Y2Fe14B) to 669 K (for Gd2Fe14B). Anisotropy fields (20 C) range from 27 to 71 kOe. Results for Y2Fe14B and Gd2Fe14B suggest that about 40% of the anisotropy in Nd2Fe14B originates with the Fe sublattice. The Fe moment in these systems exceeds by a small margin that of elemental Fe, suggesting that B is acting as an electron donor. The Nd moment in Nd2Fe14B is estimated as 3.0 μB, which is 92% of the free ion moment. The NdFe and GdFe couplings are ferromagnetic and antiferromagnetic, respectively. Coupling for these systems conforms to the systematics observed earlier for simpler rare earth intermetallics.

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This work was supported by the Army Research Office, Research Triangle Park, NC 27709, USA.

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