Propiedades estructurales y magnéticas de aleaciones cristalinas desordenadas Fe50Mn25+xSn25−x con x =-1.25, 0.0, 2.5, 5.0, 7.5

Wilber Pachín, Víctor A. Peña, Misael León, Chachi Rojas, José J. Medina, Carlos V. Landauro, Justiniano Quispe, Jorge Agüero, Edson C. Passamani, Elisa Baggio-Saitovitch

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

Resumen

Disordered crystalline Fe50Mn25+xSn25−x alloys, with x =-1.25, 0.0, 2.5, 5.0, 7.5 (close to the full-Heusler alloys), were arc-melted in a high purity argon atmosphere and the molten pellets were individually sealed in quartz tubes also under argon atmosphere. Subsequently, they were annealed at 1173 K for 4 days, being finally quenched in a bath with cold water. Structural and magnetic properties have systematically been studied using X-ray diffraction,57Fe, and119Sn Mössbauer spectroscopies, and magnetization measurements recorded at room temperature. Rietveld refinement of the X-ray diffraction patterns of the annealed samples with x =-1.25 and 0 has revealed the presence of two hexagonal crystallographic phases: (i) a chemically disordered solid solution identified as ε−(Fe/Mn)3Sn (majority fraction) and (ii) the ε−Fe5Sn3 intermetallic compound (minority fraction). For samples with x = 2.5, 5.0, and 7.5, the Rietveld analysis has only indicated the presence of a chemically disordered solid solution identified as ε−(Fe/Mn)3(Sn/Fe/Mn). Although compositions of the Fe50Mn25+xSn25−x alloys are close to that of full-Heusler alloys, none of them has the expected L21 structure. The average crystallite sizes, estimated from the Williamson-Hall method, are in the range of 256-62 nm. The average sizes has gradually decreased as the x-content is increased. Mössbauer results have shown localized-type magnetism from Fe non-equivalent sites, and itinerant-like magnetism on119Sn-probes. Magnetic hysteresis loops, recorded at 300 K for a maximum field of 2200 Oe, have indicated that the remanent and coercive fields have systematically decreased as the x-parameter has increased. Coercive fields are in the range for soft magnets (1-20 Oe).

Título traducido de la contribuciónStructural and magnetic properties of disordered crystalline Fe50Mn25+xSn25−x alloys with x =-1.25, 0.0, 2.5, 5.0, 7.5
Idioma originalEspañol
Páginas (desde-hasta)43-62
Número de páginas20
PublicaciónMomento
Volumen2021
N.º62
DOI
EstadoPublicada - 2021

Nota bibliográfica

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Palabras clave

  • Disordered solid solutions
  • Fe Mössbauer spectroscopy
  • Heusler alloys
  • Sn Mössbauer spectroscopy
  • Transferred magnetic hyperfine fields

Huella

Profundice en los temas de investigación de 'Propiedades estructurales y magnéticas de aleaciones cristalinas desordenadas Fe<sub>50</sub>Mn<sub>25+x</sub>Sn<sub>25−x</sub> con x =-1.25, 0.0, 2.5, 5.0, 7.5'. En conjunto forman una huella única.

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