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|Type:||Artigo de periódico|
|Title:||STRESS-INDUCED MAGNETIZATION IN PR2FE17NX COMPOUNDS|
|Abstract:||The dependence on x of the phases present in Pr2Fe17Nx powder particles nitrided at 400 degrees C is studied by means of Mossbauer spectroscopy. The results are compared with thermomagnetic analysis data and confirm the formation of a nitrogen-saturated core, as discussed in the literature, which is attributed to the diffusion of nitrogen through extended defects. The occurrence of three distinct Mossbauer subspectra is associated with the presence of the nitrogen-saturated phase with x = (2.8 +/- 0.2), the original binary phase and a volume fraction of the Pr2Fe17 phase which becomes magnetic at room temperature due to the lattice expansion provoked by a stress-strain field within the particles. A model for the partially nitrided particles is employed successfully to account for the changes in the subspectral areas as well as the approach to saturation observed in the average hyperfine field of samples with nitrogen contents as low as x = 1.5; it also produces a preliminary value for the Poisson ratio (mu = 0.2) of the Pr2Fe17 phase.|
|Editor:||Elsevier Science Bv|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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