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Y-type hexaferrite samples Ba2ZnxCo2-xFe12O22 with x = 0, 1 and 2 wereprepared from precursors synthesized by the citrate sol-gel auto combustionmethod. The powders were sintered at 1100{\deg} C for four hours. X-raydiffraction, scanning electron microscopy and M\"ossbauer spectroscopy wereused to investigate the effect of ball milling on the structure, microstructureand on the hyperfine parameters. X-ray diffraction revealed the presence of asingle Y-type hexaferrite in all sintered samples. This phase persisted insamples milled for periods up to four hours. Scanning electron microscopyimages indicated that the particles changed shape, and their sizes reduced by afactor of 10 for milling times of four hours. Room temperature M\"ossbauerspectra of the hexaferrites elucidated the distribution of the various cationsat the various sites of the hexaferrite lattice. The hyperfine field (Bhf)associated with each component was found to decrease almost exponentially withincreasing milling time. The reduction in hyperfine field was associated withthe weakening of the superexchange interactions between the spin-up andspin-down sublattices as a consequence of replacing Co2+ magnetic ions bynon-magnetic Zn2+ ions and with the microstructure in the milled samples.

Structural and Mossbauer studies of ball milled Co-Zn Y-type hexaferrites