Mössbauer and susceptibility studies of FeMoVO<SUB>7</SUB>

Abstract

The oxidic phase FeMoVO7 of the Fe2O3-V2O5-MoO3 system has been synthesized. Susceptibility measurements from 4.2 K to room temperature display an antiferromagnetic behaviour with an effective magnetic moment of 5.80ώb. This value, and the measured Mossbauer isomer shift of 0.40±0.02 mm/s, are characteristic of high-spin Fe(III). The lowTn value of 15 K suggests a weak interaction among the Fe-O polyhedra. The relative small QS=0.28±0.02 mm/s found in this compound shows that the Fe-O polyhedra symmetry is close to octahedral and almost undistorted.