Abstract
Nanocrystalline Se–xFe (x=3 and 5wt%) samples were prepared by solid state reaction. XRD revealed the presence of two phases; FeSe2 and Se. HRTEM showed the epitaxial growth of FeSe2 on Se. The magnetization measurements showed ferromagnetic behavior above room temperature for sample with x=5wt%. The a.c. conductivity for x=3wt% follows the overlapping large polaron tunneling model, while for (x=5wt%) sample it follows the correlated barrier hoping model. The temperature dependence of the dielectric measurements revealed an anomaly above room temperature for (x=5wt%) sample, while it appeared at room temperature for (x=3wt%) sample.
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