Effect of oxygen on magnetic properties of Nd-Fe-B magnets

Journal Article · Tue Nov 15 04:00:00 EST 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.342284· OSTI ID:7017173

Kim, A S

Oxygen plays a very important role in the magnetic properties of R-Fe-B-type alloys. As the oxygen content increases in Nd-Fe-B and Nd-Dy-Fe-Al-B alloys, the alloys gradually lose their magnetic and thermomagnetic properties: the H/sub c//sub i/ decreases and both the temperature coefficient of H/sub c//sub i/ and the irreversible temperature loss increase. The degradation of thermomagnetic properties may be accounted for by depletion of the Nd-rich phase in the grain boundaries through Nd oxidation. High coercivity magnets, relatively stable with respect to temperature, can be produced by minimizing the oxygen content in R-Fe-B alloys.

• Research Organization: I. G. Technologies, Inc., 405 Elm Street, Valparaiso, Indiana 46383
• OSTI ID: 7017173
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 64:10; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
BORIDES
BORON ALLOYS
BORON COMPOUNDS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DYSPROSIUM ALLOYS
GRAIN BOUNDARIES
IRON ALLOYS
IRON BORIDES
IRON COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETS
METALLURGY
MICROSTRUCTURE
NEODYMIUM ALLOYS
NEODYMIUM BORIDES
NEODYMIUM COMPOUNDS
OXIDATION
PERMANENT MAGNETS
PHYSICAL PROPERTIES
POWDER METALLURGY
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS