Magnetism of Pr sub 2 (Fe sub 1 minus x minus y Co sub x Al sub y ) sub 17 alloys with a Th sub 2 Zn sub 17 -type structure

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345510· OSTI ID:7171787

Weitzer, F; Klesnar, H; Hiebl, K; Rogl, P ^[1]

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1. Institut fuer Physikalische Chemie der Universitaet Wien, A-1090 Wien, Waehringerstrasse 42, Austria (AT)

Alloys with the composition Pr{sub 2}(Fe{sub 1{minus}{ital x}}Co{sub {ital x}}){sub 17{minus}{ital y}}Al{sub {ital y}} have been synthesized by the arc-melting technique followed by 125-h annealing at 900 {degree}C in evacuated silica capsules. From room-temperature x-ray powder diffraction analysis a complete solid solution Pr{sub 2}(Fe{sub 1{minus}{ital x}}Co{sub {ital x}}){sub 17{minus}{ital y}}Al{sub {ital y}} has been observed for all values of 0{le}{ital x}{le}1 and 0{le}{ital y}{le}5.1. All alloys were found to crystallize with the Th{sub 2}Zn{sub 17}-type structure; Al atoms tend to preferentially occupy the (6{ital c}) sites. Fe/Co substitution generally leads to an increase of the Curie temperature and of the magnetocrystalline anisotropy, thereby enhancing the remanence as well as the coercivity. These effects are predominantly due to the strongly distant-dependent exchange interactions of the Fe-Fe(Co) and the Fe(Co)--rare-earth coupling mechanism. Whereas most of the alloys exhibit easy-plane magnetism, a small range exists in the Pr{sub 2}(Fe{sub 1{minus}{ital x}}Co{sub {ital x}}){sub 17{minus}{ital y}}Al{sub {ital y}} system (0.38{lt}{ital x}{lt}0.82, 300 K), in which the crystallographic {ital c} axis is the direction of easy magnetization. Small amounts of Al, however, close the easy-axis region at {ital y}=1.8 ({similar to}300 K).

• OSTI ID: 7171787
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:5; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
ANISOTROPY
COBALT ALLOYS
COERCIVE FORCE
COHERENT SCATTERING
CURIE POINT
DIFFRACTION
DISPERSIONS
IRON ALLOYS
MAGNETIC PROPERTIES
MEDIUM TEMPERATURE
MIXTURES
PHYSICAL PROPERTIES
POWDERS
PRASEODYMIUM ALLOYS
RARE EARTH ALLOYS
SCATTERING
SOLID SOLUTIONS
SOLUTIONS
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
X-RAY DIFFRACTION