Magnetostriction of magnesium ferrous ferrites

Author

Brabers, V. A M ; Hirsch, A.A. ; Van der Vleuten, W.C. ; Van Doremal, P.

Author_Institution

Eindhoven University of Technology, Eindhoven, Netherlands

Volume

14

Issue

5

fYear

1978

fDate

9/1/1978 12:00:00 AM

Firstpage

895

Lastpage

897

Abstract

Magnetostriction constants λ111and λ100of single crystals of magnesium ferrous ferrites MgxFe3-xO4were measured from 80 to 320 K in the composition range $0.05 \\leq x \\leq 0.9$ . The single crystals were obtained by zone melting polycrystalline rods, which were prepared by sintering mixtures of very pure Fe2O3and MgO. The constant λ111at room temperature of this ferrite series is proportional to the third power of the oetahedral sublattice magnetization, suggesting that λ111is mainly determined by the octahedral Fe²⁺ions. For compositions with x > 0.6, λ111is nearly temperature independent, while for x < 0.3 this magnetostriction decreases gradually with decreasing temperature, reaching negative values at about 100 K. Further it 0was found that the average magnetostriction at 300 K ( $\\lambda _{s} = 2/5 \\lambda _{100} + 3/5 \\lambda _{111}$ ) decreases nearly linearly with x, being zero at x = 0.92. The constant λ100changes slightly with composition and temperature ( $\\sim - 20.10^{-6}$ ).

Keywords

Ferrites; Magnetic thermal factors; Magnetostriction; Atmosphere; Crystals; Ferrites; Magnesium; Magnetic field induced strain; Magnetic field measurement; Magnetostriction; Saturation magnetization; Strain measurement; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1978.1059805

Filename

1059805