Abstract
A new process to prepare single-phase nano-sized ferrites, Ni 0.8− x Cu 0.2Zn x Fe 2O 4 with x = 0.1–0.7, was developed using egg-white precursors. TG measurement showed that, the precursors must be calcined at 550 °C. XRD patterns indicated the formation of single-phase cubic ferrites with particle size in the range 28.7–48.4 nm. TEM image gave particle size agrees well with that estimated using XRD. FT-IR spectroscopy showed the characteristic ferrite bands. Hysteresis loops measurements exhibited an increase in the saturation magnetization value ( M s) up to zinc content of 0.2 followed by unexpected decrease, which suggests the preference of Zn 2+ ions to occupy octahedral sites. The decrease in the coercivity ( H c) with increasing zinc content is attributed to the lower magneto-crystalline anisotropy of Zn 2+ ions compared to Ni 2+ ions. Temperature dependence of the molar magnetic susceptibility ( χ M) suggested a ferrimagnetic behavior of the investigated samples and showed a decrease in the value of the Curie temperature ( T C) with increasing zinc.
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