Crystallite Size and Magnetic Properties of HDDR Powders Obtained from PrFeCoBNb Alloys
The first goal of this work involved the study of HDDR powders obtained from annealed alloys with the general formula: PrxFe77.9-xCo16B6Nb0.1 (x = 12; 12.5; 13; 13.5 and 14). The alloys were processed at desorption / recombination temperature of 840°C. The highest magnetic properties were obtained with 13.5 at. % Pr (Br= 1000mT and µ0iHc= 890mT). The alloy with a minimum praseodymium content (12 at. %) exhibited the lowest magnetic properties (Br= 350mT e iHc= 120mT). The second aim of the work involved the characterization of HDDR powders using X-ray diffraction for phase quantification and mean crystallite sizes determination of the hard magnetic phase. The processed powders were characterized by scanning electron microscopy (SEM).
Lucio Salgado and Francisco Ambrozio Filho
S.C. Silva et al., "Crystallite Size and Magnetic Properties of HDDR Powders Obtained from PrFeCoBNb Alloys", Materials Science Forum, Vols. 660-661, pp. 308-313, 2010