Hydrogen-induced amorphization and its effect on magnetic properties of the Laves-phase GdFe/sub 2/ compound

Journal Article · Thu Oct 15 00:00:00 EDT 1987 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.339340· OSTI ID:6255558

Aoki, K; Nagano, M; Yanagitani, A; Masumoto, T

The influence of hydrogenation on the structural change and magnetic properties of the Laves-phase GdFe/sub 2/ compound has been investigated. Crystalline c-GdFe/sub 2/ absorbs 4.4 hydrogen atoms per formula unit without any change in the crystal structure below 423 K. On the other hand, GdFe/sub 2/ transforms to amorphous a-GdFe/sub 2/H/sub 3.6/ by hydrogenation from 423 to 523 K, where the decomposition of GdFe/sub 2/ into GdH/sub 2/ and ..cap alpha..-Fe is prevented. The same amount of hydrogen (3.6 atoms per formula unit) dissolves in amorphous alloys produced by both hydrogenation and rapid quenching. Hydrogenation sharply reduces the Curie temperature of the crystalline alloy from 818 to 107 K, in contrast to the Curie temperature of 443 K for the hydrogen-induced amorphous alloy. The temperature dependence of the magnetization of the hydrogen-induced amorphous alloy is identical to that of the hydrogenated rapidly quenched amorphous alloy, suggesting similarity of their structures. The magnetization of the hydrogen-induced amorphous alloy shows a broad peak around 300 K. Above 300 K the magnetization of the amorphous alloys is largely uninfluenced by hydrogen. Below the peak it is reduced by hydrogenation.

• Research Organization: Institute for Materials Research, Tohoku University, Sendai 980, Japan
• OSTI ID: 6255558
• Journal Information: J. Appl. Phys.; (United States), Vol. 62:8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GADOLINIUM ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
CURIE POINT
LAVES PHASES
MAGNETIZATION
IRON ALLOYS
AMORPHOUS STATE
EXPERIMENTAL DATA
HYDROGENATION
MAGNETIC PROPERTIES
METALLIC GLASSES
ALLOYS
CHEMICAL REACTIONS
DATA
INFORMATION
NUMERICAL DATA
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
360104* - Metals & Alloys- Physical Properties
360102 - Metals & Alloys- Structure & Phase Studies