Magneto-volume effects in rare-earth transition metal intermetallics

Author

Brouha, M. ; Buschow, K.H.J. ; Miedema, A.R.

Author_Institution

Philips Research Laboratories, Eindhoven, the Netherlands.

Volume

10

Issue

2

fYear

1974

fDate

6/1/1974 12:00:00 AM

Firstpage

182

Lastpage

185

Abstract

The pressure derivative of the Curie temperature, the compressibility, and the thermal expansion of several representative members of the group of $R$ -Co and $R$ -Fe intermetallics ( $R$ stands for rare-earth elements Y, Th, and in one case Zr) has been studied. The results derived for the volume dependence of Tcagree rather well with the relation ( $d \\ln T_{c})/(d \\ln V) = a+b/T_{c}^{2}$ in which, for both series of compounds (Co and Fe), the constant a equals about -5/3. This result favors an interpretation of the magnetic properties of these compounds in terms of the collective electron model rather than one in terms of localized moments. For some compounds the thermal expansion above room temperature has been studied. A considerable reduction of the thermal expansion has been observed near Tcfor those compounds for which $dT_{c}/dp$ is large and negative (invar effect).

Keywords

Cobalt-rare earth compounds; Magnetic thermal effects; Rare earth-iron compounds; Annealing; Electrons; Intermetallic; Iron; Magnetic separation; Soft magnetic materials; Strain measurement; Temperature dependence; Thermal expansion; Zirconium;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1974.1058330

Filename

1058330