Moessbauer, magnetic, and electronic-structure studies of YFe[sub 12[minus][ital x]]Mo[sub [ital x]] compounds
- Behlen Laboratory of Physics and Center for Materials Research Analysis, University of Nebraska, Lincoln, Nebraska 68588-0111 (United States)
- Department of Physics, Wichita State University, Wichita, Kansas 67260 (United States)
Moessbauer spectra, magnetization measurements, and self-consistent spin-polarized electronic structures of YFe[sub 12[minus][ital x]]Mo[sub [ital x]], where [ital x]=0.5, 1.0, 2.0, 3.0, and 4.0, are reported. The ternary compounds YFe[sub 12[minus][ital x]]Mo[sub [ital x]] have the crystalline tetragonal ThMn[sub 12] structure. Analyses of the Moessbauer spectra show that Mo atoms occupy the 8[ital i] Fe sites of the ThMn[sub 12] structure, in agreement with previous observations. Room-temperature magnetic and Moessbauer measurements show that the compounds with [ital x][le]2.0 are ferromagnetic and with [ital x][ge]3.0 are paramagnetic. Measurements at 25 K show that all the samples are magnetically ordered. The magnetic hyperfine field is found to decrease with increasing Mo concentration, which is in qualitative agreement with the calculated magnetic moments. The calculated magnetization decreases less rapidly with increasing [ital x] than the experimental data. In general the data suggest that with increasing Mo concentration there is an increase of antiferromagnetic coupling among the Fe moments, which leads to cluster-glass or spin-glass-like phenomena. The measured isomer shift relative to [alpha]-iron is found to decrease linearly with [ital x].
- DOE Contract Number:
- FG02-86ER45262
- OSTI ID:
- 6841779
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:17; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOY SYSTEMS
AMBIENT TEMPERATURE
ELECTRONIC STRUCTURE
FERROMAGNETISM
HYPERFINE STRUCTURE
IRON COMPOUNDS
MAGNETIC MOMENTS
MAGNETISM
MAGNETIZATION
MOESSBAUER EFFECT
MOLYBDENUM COMPOUNDS
PARAMAGNETISM
POLARIZATION
REFRACTORY METAL COMPOUNDS
SPIN GLASS STATE
TERNARY ALLOY SYSTEMS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS