Title :
Microstructural studies of oxide doped PrCo5magnets
Author :
Ghandehari, M.H. ; Fidler, J.
Author_Institution :
Union Oil Science & Technology Division, Brea, California USA
fDate :
9/1/1985 12:00:00 AM
Abstract :
Pr0.8Sm0.2Co5magnets doped with Cr2O3have displayed high coercivity similar to SmCo5. Transmission electron microscopy (TEM), electron diffraction and x-ray microanalysis of a doped magnet showed absence of grains with high density basal stacking faults identified as (Pr,Sm)2Co7and (Pr,Sm)5Co19whereas microprecipitates of (Pr,Sm)2O3and CaO were located within the 1-5 grains and near grain boundaries, respectively. The resultant coercivity increase is explained by a model based on the nucleation of reversed domains. Grains with a high density of martensitic transformation twins which occasionally occur in (Pr,Sm)Co5magnets were identified as (Pr,Sm)Co2.
Keywords :
Permanent magnets; Chromium; Coercive force; Demagnetization; Electron microscopy; Grain boundaries; Grain size; Magnets; Stacking; Transmission line matrix methods; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1985.1064030
