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- W1669196554 abstract "The effect of plasma nitrogenation on the structural and magnetic properties of Pr2Fe17 and Sm2Fe17 compounds was investigated by Mössbauer spectroscopy, thermomagnetic measurements, optical metallography, and electronic microprobe analysis. Samples were prepared starting from Pr2Fe17 and Sm2Fe17 commercial powders with 20 μm granulometry, submitted to nitrogenation treatment at 400 °C in 10 Torr atmosphere of 80%H2–20%N2 during periods up to 8 h. Our results show the formation of R2Fe17N3 and metallic Fe and indicate the existence of two other phases. The Mössbauer parameters of the latter are characterized by magnetic hyperfine fields (peak values) of 21 (24) and 3 (4) T and isomer shifts of 0.17 and 0.24 (0.24 and 0.29) mm/s for Pr (Sm). Their magnetic-phase transitions were determined to be close to 250 and 90 °C. Our results suggest that these 2:17 phases present stoichiometries close to R2Fe17N8 and R2Fe17N11, respectively." @default.
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- W1669196554 date "2000-05-01" @default.
- W1669196554 modified "2023-10-17" @default.
- W1669196554 title "Plasma nitrogenation of Pr2Fe17 and Sm2Fe17" @default.
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- W1669196554 doi "https://doi.org/10.1063/1.373334" @default.
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