Magnetoelastic contributions to the elastic constants of holmium, dysprosium, and terbium

Conference · Thu Jan 01 04:00:00 EST 1976 · AIP (Am. Inst. Phys.) Conf. Proc.; (United States)

OSTI ID:7180381

Gama, S; Kale, B M; Torikachvili, M S; Ferreira, O; Arellano, M; Pinatti, D G; Donoho, P L

The magnetoelastic contributions to the elastic constants of Ho, Dy, and Tb were determined at temperatures in the paramagnetic range in applied fields up to 75 kG. Magnetization measurements were also made in order to facilitate the comparison of the experimental results with theory. Initially the results were analyzed in terms of a theory due to Southern and Goodings, but the agreement was poor. The field dependence predicted by this theory, using magnetoelastic coupling constants estimated from static magnetostriction data, was generally much smaller than the observed dependence, and, in many cases, the theory did not predict the correct qualitative field or temperature dependence. The reasons for these discrepancies are, apparently, the use by Southern and Goodings of first-order perturbation theory, together with an inappropriate application of finite-strain theory. A calculation of the magnetoelastic contribution to the elastic constants was carried out employing the molecular-field approximation, but without using perturbation theory and using only the conventional small-strain tensor. This approach, similar to that of Freyne, is in much better agreement with the experimental results.

• Research Organization: Instituto de Fisica Teorica, Sao Paulo, Brazil
• OSTI ID: 7180381
• Conference Information: Journal Name: AIP (Am. Inst. Phys.) Conf. Proc.; (United States) Journal Volume: 29
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
DYSPROSIUM
ELASTICITY
ELEMENTS
HOLMIUM
MAGNETIC PROPERTIES
MAGNETOSTRICTION
MECHANICAL PROPERTIES
METALS
PHYSICAL PROPERTIES
RARE EARTHS
TENSILE PROPERTIES
TERBIUM