Moessbauer study of permanent-magnet materials: Sm[sub 2]Fe[sub 17[minus][ital x]]Al[sub [ital x]] compounds

Journal Article · Tue Nov 15 00:00:00 EST 1994 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.358340· OSTI ID:6978159

Al-Omari, I A; Jaswal, S S; Fernando, A S; Sellmyer, D J ^[1]

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1. Behlen Laboratory of Physics and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588-0111 (United States)

The Fe[sup 57] Moessbauer spectra of Sm[sub 2]Fe[sub 17[minus][ital x]]Al[sub [ital x]], where [ital x]=0, 1.0, 2.0, 3.0, and 4.0, have been measured at room temperature and analyzed. The ternary compounds Sm[sub 2]Fe[sub 17[minus][ital x]]Al[sub [ital x]] have the rhombohedral Th[sub 2]Zn[sub 17] structure. Moessbauer measurements showed that all the compounds studied were ferromagnetic. The average hyperfine field was found to decrease with the increasing aluminum concentration, which is in qualitative agreement with magnetic measurements. The decrease in the average hyperfine field was from 224 kOe at [ital x]=0 to 174 kOe at [ital x]=4. By fitting the spectra we found that the hyperfine fields for the iron sites decrease in the order 6[ital c], 9[ital d], 18[ital f], and 18[ital h]. The measured average isomer shift relative to [alpha]-iron was found to increase linearly with [ital x]. Analysis of the spectra showed that Al atoms occupy the 6[ital c], 18[ital h], and 18[ital f], but not 9[ital d], Fe sites and the fraction of occupancy of Al was found to depend on [ital x].

• OSTI ID: 6978159
• Journal Information: Journal of Applied Physics; (United States), Vol. 76:10; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM COMPOUNDS
MOESSBAUER EFFECT
IRON COMPOUNDS
SAMARIUM COMPOUNDS
AMBIENT TEMPERATURE
CRYSTAL STRUCTURE
ISOMER SHIFT
MAGNETIZATION
PERMANENT MAGNETS
TEMPERATURE RANGE 0000-0013 K
MAGNETS
RARE EARTH COMPOUNDS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
360104* - Metals & Alloys- Physical Properties