Mossbauer and structural studies of Fe0.7-xVxAl0.3 alloys

We report the Mossbauer and structural studies of the alloy system Fe0.7-xV xAl0.3 where x = 0, 0.02, 0.06, 0.1, 0.2, and 0.3. X-ray diffraction indica tes that all the samples studied have single phase with body center cubic s tructure. The lattice parameter (a) increases with increasing the vanadium concentration. Room temperature Mossbauer studies show magnetic ordering fo r small values of x and paramagnetic behavior for large values of x. The Mo ssbauer 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. Th e relation between the hyperfine field and the isomer shift in the hyperfin e field distribution is linear. The average hyperfine field and isomer shif t were found to decrease with increasing V concentration. The results are i nterpreted in terms of local environmental effects on the hyperfine interac tions. (C) 2000 Elsevier Science B.V. All rights reserved.