High coercivities in as-cast Nd-Fe and Nd-Fe-Ti alloys

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

DOI:https://doi.org/10.1063/1.342166· OSTI ID:7017036

Tsoukatos, A; Strzeszewski, J; Hadjipanayis, G C

Bulk Nd/sub 73/Fe/sub 27/ and Nd/sub 66.8/Fe/sub 24.7/Ti/sub 8.5/ alloys exhibit relatively high coercivities with a room-temperature value of about 5 kOe. The origin of the high coercivities has been investigated with magnetic and structural studies. Thermomagnetic data show the presence of a magnetic phase with a Curie temperature of about 270 /sup 0/C which is close to that of NdFe/sub 2/. This phase is metastable changing to a magnetic phase with an ordering temperature of 65 /sup 0/C after heating to 700 /sup 0/C. The lower Curie temperature phase is related to Nd/sub 2/Fe/sub 17/. The coercivity of the sample decreased to negligible values after the heat treatment. It is believed that the high coercivities are due either to the anisotropic NdFe/sub 2/ phase or possibly to an oxygen-stabilized Nd-Fe-O phase which is probably present in the form of fine particles.

• Research Organization: Department of Physics, Kansas State University, Manhattan, Kansas 66506
• OSTI ID: 7017036
• 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
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
AMBIENT TEMPERATURE
CURIE POINT
DIAGRAMS
HEAT TREATMENTS
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
NEODYMIUM ALLOYS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
THERMODYNAMIC PROPERTIES
TITANIUM ALLOYS
TRANSITION TEMPERATURE