Mössbauer and structural studies of Fe0.7−xVxAl0.3 alloys

Abstract We report the Mossbauer and structural studies of the alloy system Fe 0.7− x V x Al 0.3 where x =0, 0.02, 0.06, 0.1, 0.2, and 0.3. X-ray diffraction indicates that all the samples studied have single phase with body center cubic structure. The lattice parameter ( a ) increases with increasing the vanadium concentration. Room temperature Mossbauer studies show magnetic ordering for small values of x and paramagnetic behavior for large values of x . The Mossbauer spectra were fitted by a distribution of magnetic hyperfine fields for small values of x and two singlets were added for large values of x . The relation between the hyperfine field and the isomer shift in the hyperfine field distribution is linear. The average hyperfine field and isomer shift were found to decrease with increasing V concentration. The results are interpreted in terms of local environmental effects on the hyperfine interactions.