INIFTA   05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
Evolution under thermal annealing of Mn-doped iron disilicides obtained by ball milling
Autor/es:
J MARTINEZ,; J. RUNCO; S. M. COTES; M. A. TAYLOR; J. DESIMONI
Revista:
HYPERFINE INTERACTIONS
Editorial:
Springer Netherlands
Referencias:
Año: 2009 vol. 178 p. 13 - 17
ISSN:
0304-3843
Resumen:
 Phase formation in the Mn doped beta-FeSi2 system (Fe(1-x)Mn(x)Si(2), with 0.00 <x < 0.24) was studied using X-ray diffraction and Mössbauer spectroscopy. Samples were prepared by the simultaneous mill of pure Si, Mn and Fe under Ar atmosphere followed by an annealing at 1,123 K during 4 h at 1 × 10(−7) Torr. After milling, an admixture of beta-FeSi(2), alfa-FeSi(2) and epslon-FeSi phases was present while alfa-FeSi(2) disappeared after annealing, resulting beta-FeSi(2) the main phase. Depending on Mn concentration, small amounts of epsilon-FeSi and Si segregation were also observed. A preferential substitution of Fe atoms by Mn ones in the FeII site of the beta-FeSi(2) regular lattice was inferred from the Moessbauer results.