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Effect of Carboxymethyl Cellulose Concentration on Structural, Morphological and Magnetic Properties of Barium Hexaferrite: A Study Based on Sol-Gel Auto-Combustion Method

This study was intended to assess the role of carboxymethyl cellulose (CMC) as a chelating agent in
the synthesis of barium hexaferrite (BaFe12O19:BaF). The effect of varying concentrations of CMC
was studied via the sol-gel auto-combustion method following the requirements of green chemistry
synthesis. The formation of BaF nanoparticles was confirmed using XRD, SEM, EDS, VSM, FTIR
and UV-Vis-DRS techniques. The characterized XRD peak indicates the formation of good quality
crystalline samples at 6% (w/v) of CMC concentration. SEM analysis suggested that the synthesized
BaF is spherical, with sizes ranging from 10-15 nm. The M-H hysteresis loops obtained for the samples
showed their soft and hard magnetic behaviour. With the increasing CMC concentration, magnetism
becoming harder and an increase in the Ms value can be observed. The UV-Vis-DRS techniques revealed
that the band gap energy of synthesized BaF increased with an increase in the concentration of CMC.