Low temperature preparation and characterization of intermetallics-Fe₂W, FeMo and some ternary Fe-W-Mo systems

Abstract

Monophase Fe₂W and FeMo intermetallics have been prepared by hydrogen reduction of Fe₂WO₆ and FeMoO₄ oxides respectively below 1050 K. The ternary intermetallics Fe₂W_0.9Mo_0.1 and FeMo_0.9W_0.1 have also been prepared by a similar method from the respective substituted oxides. The oxides and the intermetallics have been characterized by X-ray powder diffraction, X-ray photoelectron and Mossbauer spectroscopies. The observed negative isomer shift of Fe in the intermetallics is attributed to an increase in the electron density in Fe by electron transfer from W or Mo to Fe.