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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
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