Retracted: Effect of sintering temperature on apparent density and transport properties of NiFe2O4: synthesized from nanosize powder of NiO and Fe2O3 (Springer Nature)

Abstract

Retraction This article was mistakenly published twice. For this reason this duplicate article has now been retracted. For citation purposes please cite the original: http://www.inljournal.com/?_action=articleInfo&article=19 Abstract Polycrystalline NiFe2O4 was prepared by solid-state reaction from nanosize powders of NiO and Fe2O3 which were synthesized by wet chemical method. Enhancement of apparent density of the sample has been observed with the increase in sintering temperature and has great influence on the transport properties of NiFe2O4. Decrease in resistivity with increasing temperature confirms the semiconducting behavior of the prepared ferrites. Also, it was found that the value of resistivity at room temperature decreased with the increase in sintering temperature. Variation of activation energy has been found for different sintering temperatures. Dielectric constant shows the normal behavior of the ferrite materials which can be explained on the basis of Koops' two-layer model and Maxwell-Wagner polarization theory. Also, the increased value of dielectric constant (κ) has been observed with the increase in sintering temperature.