Covalency and Racah parameters of Fe3+ in Mn-Zn-Cr nanoferrites

This study presents the covalency and Racah parameter (B) of Fe3+ in Mn-Zn-Cr nanoferrites, which prepared by citrate-nitrate combustion method. Racah parameter was determined from the spectral data. The bands in the range of interest in optical absorbance are wide and asymmetric; a deconvolution (deconvolution to their component bands) of the experimental spectra becomes compulsory. Further, these spectra were employed to obtain Racah parameter. Racah parameter was decreased, with further Fe addition, from 540 to 441 cm(-1). Also, nephelauxetic ratio (beta) was decreased from 0.532 to 0.435. This denotes that the bonds of Fe3+ and its surroundings become more covalent (the covalency is increased).

Automated summary

The covalency and Racah parameter of Fe3+ in Mn-Zn-Cr nanoferrites prepared by citrate-nitrate combustion method were investigated. The Racah parameter decreased with additional Fe, indicating an increase in covalency. This study highlights changes in the bond characteristics of Fe3+ with its surroundings.