Mössbauer study of nanocrystalline PrFeB and PrFeCrB alloys

• Published in: Journal of magnetism and magnetic materials Vol. 226; pp. 1426 - 1427
• Main Authors: Barra-Barrera, A.D, Murakami, R.K, Partiti, C.S.M, Villas-Boas, V
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2001
• Subjects: Mössbauer spectroscopy; Nanocrystalline materials; Permanent magnets — melt-spun; Nanocrystalline materials; Mössbauer spectroscopy; Permanent magnets — melt-spun
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(01)00047-6

Ribbons of Pr 4.5Fe 77B 18.5 and Pr 5Fe 74Cr 3B 18 alloys were produced by melt spinning and then annealed by flash or conventional annealing to develop enhanced-remanence nanocrystalline magnetic material. These materials were studied by magnetic measurements, X-ray diffraction and Mössbauer spectroscopy in order to understand the relationship between structural and magnetic properties. These analyses showed that the phases present in these materials are Pr 2Fe 14B, Fe 3B and α-Fe. The samples with Cr present a coercive field 50% higher than the Cr-free samples. The Mössbauer spectra were analyzed as a superposition of the well-known spectra of Pr 2Fe 14B, Fe 3B and α-Fe. The mean hyperfine magnetic field of each phase was obtained from the spectral analysis, as well as, the relative amount of each phase present. From Mössbauer results it seems that Cr atoms preferentially dissolves in the Fe 3B phase.