Transactions of the INDIAN CERAMIC SOCIETY Vol. 48 1989
Preparation and Characterization of Coprecipitated
Strontium Hexaferrite
J. MALLIKARJUNA * AND A. R. DAS
Pages : 86-89
DOI : 10.1080/0371750X.1989.10822954
Abstract
Strontium hexaferrite was prepared from coprecipitated strontium
iron complex obtained from metal chloride solutions in the presence
of ammonium carbonate. Coprecipitation parameters were varied in
the ranges pH 7.5-10, dilution 0.001--0.5 moles Fe in solution and
Fe/Sr ratio 11-25. X-ray diffraction indicated crystalline SrCOa
and amorphous hydroxide of iron in the precipitate. Transmission
electron micrographs indicated decrease in particle size with decrease
in concentration of Fe, (600 A at 0.04M to 55 A at 0.001M)
and an increase with pH (400 A at pH 7.0 to 840 A at pH 9.0) when
other variables were held constant. Lattice parameters of the hexaferrite
showed c0 = 23.13 A (23.05 A) and a0 = 5.880 A (5.885 A)
with published values in parentheses. Ferritization of powders was
