Effect of Cr-doping on crystallization sequence and magnetic properties of Fe3B/Nd2Fe14B nanocomposite permanent magnets |
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| Affiliation: | 1. Graduation Program in Materials Science and Engineering, Federal University of São Carlos (UFSCar), Rod. Washington Luis km 235, CEP13565-905, Sao Carlos, SP,Brazil;2. Department of Materials Engineering (DEMa), Federal University of São Carlos (UFSCar), Rod. Washington Luis km 235, CEP13565-905, Sao Carlos, SP,Brazil;1. Bulgarian Academy of Sciences, Institute of Mollecular Biology, 1113 Sofia, Bulgaria;2. University of Sofia “St. Kliment Ohridski”, Faculty of Chemistry and Pharmacy, 1164 Sofia, Bulgaria |
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| Abstract: | Crystallization sequence starting from NdxFe82 ? xB18 and NdxFe79 ? xCr3B18(x = 3.5 – 5.5 at%) amorphous alloys has been investigated using X-ray diffractometer. In the alloys with Nd concentration around 5 at%, the intermediate compound Nd2Fe23B3 first crystallizes along with Fe3B from the amorphous state. Then, the Nd2Fe23B3 phase decomposes to form a mixture of Nd2Fe14B, Fe3B and αFe for the Cr-bearing systems, whereas it breaks up into another mixture of αFe and NdFe4B4 for the Cr-free systems. Atom probe field ion microscopy analysis has revealed that Cr is preferentially partitioned into the Fe3B phase during the crystallization process, which may stabilize the Fe3B-containing mixture exhibited in the Cr-doped systems. We can conclude that a large fraction of Nd2Fe14B produced from the distinct decomposition scheme of the intermediate Nd2Fe23B3 phase exhibited in the Cr-doped systems brings about the high coercivity materials. |
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