Abstract
Zinc ferrite samples were prepared by two different routes which are chemical co-precipitation and standard solid state double sintering method. Structural properties of ZnFe2O4 were determined, and initial particle size was found as 5 nm in the samples prepared by chemical co-precipitation technique. The XRD patterns showed the single phase of ZnFe2O4 spinel structure and confirmed by the lattice parameter and the unmixed hkl values for both the synthesis techniques. M-H curves at room temperature showed superparamagnetic nature of the samples sintered from 200°C to 600°C, synthesized by chemical co-precipitation technique. The Mössbauer analysis at room temperature showed a doublet which is the signature of superparamagnetic nature, and it is in agreement with the acquired M-H curves. The magnetization of ZnFe2O4 synthesized by chemical co-precipitation method was found higher than the magnetization of ZnFe2O4 synthesized by the solid-state double sintering method in the sintering temperature from 1100°C to 1300°C.
Highlights
Ferrite nanoparticles have generated an extensive research attention due to numerous properties that are superior to its bulk counterpart
The unit cell of spinel ferrite is composed of 32 oxygen atoms in cubic closed-packed arrangement distributed in tetrahedral (A) and octahedral (B) sites.[8]
Considering the magnetic properties in the nanoscale range superparamagnetism, core/shell structure, spin canting, and metastable cation distribution is some of the phenomena observed in spinel ferrites.[16]
Summary
Ferrite nanoparticles have generated an extensive research attention due to numerous properties that are superior to its bulk counterpart. Considering the magnetic properties in the nanoscale range superparamagnetism, core/shell structure, spin canting, and metastable cation distribution is some of the phenomena observed in spinel ferrites.[16] Literature study revealed that in the bulk form ZnFe2O4 is paramagnetic[15] while at the nanoscale range it is superparamagnetic[17] with the higher magnetic moment. Research on zinc-substituted ferrites was done extensively.[18,19] no detailed work was found in the literature regarding the comparison of magnetic properties of ZnFe2O4 at different initial particle sizes.
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