Abstract
Powdered samples of Indian Natural Wolframites, (FexMn1−x) WO4 with x=0.95 to 0.41, obtained from seven different locations of two quartz-wolframite deposits of Degana and Sirohi in Rajasthan, have been investigated by Mossbauer spectroscopy down to 20K and magnetic susceptibility down to 77K. The Mossbauer spectra from 300K to 30K clearly indicate multiple sites which is at variance with the reported work. Below 50K a weak magnetic interaction with Hint∼45Koe is observed. The spectra above transition temperature are resolved in three doublets and explained on the basis of reported crystal structure. The values of isomer shift, quadrupole splitting and magnetic hyperfine field have been attributed to high spin ferrous ions with octahedral symmetry. Relatively small value of Q.S. (∼1.5 mm/sec. at 300K) indicate a strong contribution of the lattice term to the electric field gradient.
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