Search for site preference occupancy in (R-Ce)2Fe14B compounds
Hard magnets are key components of electrical motors present in electrical and hybrid cars, as well as the generators of wind turbines. High performance magnets almost exclusively belong to the R-Fe-B family (R = rare-earth) where the main phase is R2Fe14B and the R element is predominantly neodymium. La and Ce are the two most common rare-earth elements and the development of magnets that would incorporate them would be very important from an economical point of view. In a recent first-principle study, Alam et al. concluded that a solid solution forms in (La1-x-Cex)2Fe14B for all x and that the Ce atoms prefer the smaller R (4f ) site, in agreement with an X-ray absorption edge study. In contrast, in Nd2Fe14B, Ce is predicted to have limited alloying (x<0.5) with a preference for the larger R(4g) site. The understanding of such possible ordering and segregation is very important to guide the optimization of hard magnetic materials associating La and/or Ce with Nd. The present proposal is to establish this in (La-Ce)2Fe14B and (Nd-Ce)2Fe14B compounds by neutron scattering of powdered samples on D2b, 9 samples will be studied, the requested time is 1 day.
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GIVORD Dominique; Claire V. Colin; DEMPSEY Nora; GUNDUZ AKDOGAN Nilay; ITO Masaaki and SUARD Emmanuelle. (2015). Search for site preference occupancy in (R-Ce)2Fe14B compounds. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-668
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