Materials substitution in rare earth permanent magnets

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5229427

Cheng, S F

The magnetic properties of (Co,Fe)/sub 3n + 5/R/sub n + 1/B/sub 2n/(R = Y, Ce, CeMM, Pe, and Gd) (n = 1,2) and the ternary boride of Fe-R-B, nominally Fe/sub 14/R/sub 2/B, were investigated. For the (Co,Fe)/sub 3n + 5/R/sub n + 1/B/sub 2n/ homologous series (R = Y, Ce, CeMM, Pr, Sm, Gd) (n = 1,2,3), the results of previous work and the present investigation can be summarized as follows: (1) the magnetic moments and Curie temperatures decrease with increasing boron content in the compound series. (2) For Co-Sm-B and Co-Gd-B compound series the coercivity increases with increasing boron content in the compound, but this was not observed in other rare earth compound series. The coercive forces obtained with out special treatment have the highest values for the compounds with Sm and Gd. (3) The moment and the Curie temperature vary according to the type of rare earth element in the compound as well as its elemental moment and its coupling in the structure. The compounds with Sm have the highest curie temperatures. (4) The Fe replacement for Co atoms increases both the values of magnetic moments and Curie temperatures as the Fe content increases in the structure. The presence of Fe atoms does not increase the coercivity except for compounds based on Sm and Pr. (5) The maximum inclusion of Fe in each homologue decreases systematically with increasing series index n. (6) The addition of Zr increases the coercivity of the compound series.

• Research Organization: North Carolina State Univ., Raleigh (USA)
• OSTI ID: 5229427
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
BORON ALLOYS
CERIUM ALLOYS
CERIUM BASE ALLOYS
COBALT ALLOYS
COERCIVE FORCE
CURIE POINT
IRON ALLOYS
LANTHANUM ALLOYS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETS
MATERIAL SUBSTITUTION
MISCH METAL
PERMANENT MAGNETS
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH ALLOYS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE