The effect Mn and Al dopants on the beta-FeSi2 stabilization following a two step route: Mechanicall alloying and annealing

J. DESIMONI; J. MARTÍNEZ; S. M. COTES; J. RUNCO; M. A. TAYLOR

JOURNAL OF ALLOYS AND COMPOUNDS

Elsevier

Año: 2009 vol. 477 p. 789 - 794

0925-8388

Al and Mn dopant influence on beta-FeSi(2) phase formation were studied using X-ray diffraction, Moessbauer spectroscopy and an occupation model. Samples of Fe(1-x)R(x)Si(2) (R= Al, Mn with 0.00 < x < 0.12) were prepared by the simultaneous mill of pure Si, Fe and the dopant under Ar atmosphere followed by an annealing at 1123 K during 4 h at 1x10(−7) Torr. The addition of Al improved the stabilization of beta-FeSi2 phase, reducing the amount of alfa-FeSi from 20% to 6%. A preferential substitution at the Fe- site II by Mn atoms in beta-FeSi(2) can be inferred.