ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
R2Fe14B compounds, R = Pr, Nd, Dy, or Er, were prepared from high purity rare earths obtained from the Ames Laboratory. The magnetic properties of these and related systems with other rare earths are under investigation in our laboratories. In the present study magnetic susceptibilities were determined from the Curie temperature (TC) (556–596 K) up to a characteristic temperature Tt. Above Tt the susceptibility was observed to increase sharply and to become history-dependent, suggesting sample decomposition or a phase change. Tt = 830, 920, and 960 K for R = Pr, Nd, and Er, respectively. Curie–Weiss behavior is observed for the Pr and Nd compounds but not for Dy2Fe14B and Er2Fe14B. The susceptibility of the latter material follows the hyperbolic form described by Néel, i.e., 1/χ=1/χ0+T/C−σ/(T−θ). For R=Pr and Nd, near TC χ follows the expression χαt−γ[t=(T−TC)T−1C]. γ=1.37 for R=Pr and 1.41 for R = Nd. The iron paramagnetic moments are 4.02, 4.06, 4.09, and 4.10 μB for Pr2Fe14B and Nd2Fe14B, Dy2Fe14B and Er2Fe14B, respectively, which are close to the value (3.97 μB) obtained for Y2Fe17. The Weiss constants are 575 and 602 K, respectively, for Pr2Fe14B and Nd2Fe14B. Results indicate little itineracy of the 3d electrons in the R2Fe14B systems.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.334634
