We have investigated the structural and 57Fe Mössbauer studies on two ternary anionically substituted (3.33 atom %) compounds Fe(Sb2-yXy) for (a) X = S, Se and Te (group VI elements) and also (b) As (group V element) in FeSb2.Our aim is to see the effect of this anionic substitution in terms of the modifications occurring in the structural, electronic and magnetic properties of these ternary derivatives as compared to pristine narrow band gap semiconductor FeSb2. As this anionic substitution directly replaces the antimony atom by either S or Se or Te or As atom in the first coordination sphere of the iron octahedra, it should change anisotropic electronic and magnetic properties and therefore it would be of interest. We would like to explore the magnetic ordering due to such anionic substitution as already been observed by Y.K. Sharma and F.E. Wagner for tellurium substituted FeSb2, i.e. FeSb2-xTexthat compositions with 0 < x < 0.8 are ordered magnetically below 70K

Mössbauer Spectroscopy, FeSb2, X-ray diffraction, Paramagnetism, Orthorhombic structure