Magnetic properties of DyFe₂H₂ from ⁵⁷Fe, ¹⁶¹Dy Moessbauer effect and magnetization measurements

Conference · Sun Jan 01 00:00:00 EST 1978

OSTI ID:6427814

Viccaro, P. J.; Friedt, J. M.; Niarchos, D.; Dunlap, B. D.; Shenoy, G. K.; Aldred, A. T.; Westlake, D. G.

A single phase stable hydride with nominal composition DyFe/sub 2/H/sub 2/ is shown to have the cubic C15 Laves structure with a 5% larger lattice constant. /sup 57/Fe Moessbauer spectra show two sites with nearly equal population and with different isomer shifts and hyperfine fields. Based on the average hyperfine field at 4.2 K, an Fe moment of approximately 1.6 ..mu../sub B/ is estimated. From the /sup 161/Dy data at 4.2 K, which show a single site, a nearly free-ion moment of 9.8 ..mu../sub B/ is determined. These results, combined with the total moment of 3.5 ..mu../sub B/ from bulk magnetization measurements, indicate that the Dy and Fe moments may not be strictly antiparallel in the hydride. Relaxation effects in the /sup 161/Dy spectra above 77 K, combined with a sharp decrease in the moment with increasing temperature, imply a weakening of the Dy--Fe magnetic coupling induced by the presence of the hydrogen.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 6427814
• Report Number(s): CONF-781114-10; TRN: 79-005340
• Resource Relation: Conference: 24. conference on magnetism and magnetic materials, Cleveland, OH, USA, 14 Nov 1978
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DYSPROSIUM HYDRIDES
MAGNETIC PROPERTIES
IRON HYDRIDES
CRYSTAL STRUCTURE
HYPERFINE STRUCTURE
MOESSBAUER EFFECT
DYSPROSIUM COMPOUNDS
HYDRIDES
HYDROGEN COMPOUNDS
IRON COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360104* - Metals & Alloys- Physical Properties