EXAFS (Extended X-ray Absorption Fine-Structure Spectroscopy) study of the position of Zr within the unit cell of Sm sub 2 Co sub 17

Conference · Sun Dec 31 23:00:00 EST 1989

OSTI ID:6768036

Rabenberg, L ^[1]; Barrera, E V ^[2]; Maury, C E; Allibert, C H ^[3]; Heald, S M ^[4]

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1. Texas Univ., Austin, TX (USA). Center for Materials Science and Engineering
2. Rice Univ., Houston, TX (USA). Dept. of Mechanical Engineering and Materials Science
3. Centre National de la Recherche Scientifique, 38 - Saint-Martin d'Heres (France). Lab. de Thermodynamique et PhysicoChimie Metallurgiques
4. Brookhaven National Lab

Extended X-ray Absorption Fine-Structure Spectroscopy (EXAFS) has been used to determine the position of Zr within the unit cell of Sm{sub 2}Co{sub 17}. Zr is routinely added to Sm{sub 2}Co{sub 17} permanent magnet alloys because of its effects on their metallurgical development, but the details of its behavior remain controversial. Induction melted Sm{sub 2}Co{sub 17}:Zr ternary alloys, aged at 1180{degrees}C, then quenched, consisted of intimately mixed H2:17 and R2:17 having Zr in solid solution as well some regions of R2:17 that were poor in Zr. EXAFS spectroscopy of these specimens indicates that the most probable position for Zr is a site having two Sm near neighbor atoms and 11 Co atoms distributed over three different interatomic distances. This is consistent with a direct substitution of Zr for Co in the Co site in the mixed planes (12j in P6{sub 3}/mmc, or 18f in R3m). These results are discussed in terms of the metallurgy of 2:17 magnet alloys. 20 refs., 2 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6768036
• Report Number(s): BNL-45147; CONF-901004--7; ON: DE91001123
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ABSORPTION SPECTROSCOPY
ALLOYS
COBALT ALLOYS
COBALT BASE ALLOYS
COHERENT SCATTERING
DIFFRACTION
DISTANCE
ELEMENTS
INTERATOMIC DISTANCES
MAGNETS
METALS
MICROSCOPY
PERMANENT MAGNETS
PHASE STUDIES
RARE EARTH ALLOYS
SAMARIUM ALLOYS
SCATTERING
SPECTROSCOPY
TRANSITION ELEMENTS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
ZIRCONIUM