Structural and magnetic properties of DyFe/sub 3/ hydrides

Conference · Mon Dec 31 23:00:00 EST 1979

OSTI ID:6876859

Niarchos, D; Viccaro, P J; Dunlap, B D; Shenoy, G K; Aldred, A T

The ternary hydride phases, DyFe/sub 3/H/sub x/ with x = 1.7, 2.5, and 4.2 all retain the PuNi/sub 3/ rhombohedral structure of DyFe/sub 3/ with a maximum volume expansion of 18% for DyFe/sub 3/H/sub 4.2/. All phases show a preferential expansion parallel to the c/sub 0/ axis. From bulk magnetization measurements, the Dy-Fe spin compensation temperature is found to decrease linearly from 545/sup 0/K for DyFe/sub 3/ to 150/sup 0/K for DyFe/sub 3/H/sub 4.2/ with increasing volume of the hydride phases. The /sup 161/Dy Moessbauer results for the two Dy sites in the structure indicate a slight reduction occurs in free-ion moment found for DyFe/sub 3/ in all hydride phases. In addition, the /sup 57/Fe Moessbauer data show that the average Fe moment for the five inequivalent Fe sites increases with hydrogen concentration up to x = 2.5.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE
• OSTI ID: 6876859
• Report Number(s): CONF-800402-17
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
DYSPROSIUM COMPOUNDS
DYSPROSIUM HYDRIDES
HYDRIDES
HYDROGEN COMPOUNDS
IRON COMPOUNDS
IRON HYDRIDES
MAGNETIC PROPERTIES
PHASE STUDIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
TRANSITION ELEMENT COMPOUNDS