alpha -Fe/sub 2/O/sub 3/, gamma -Fe/sub 2/O/sub 3/, and alpha -FeOOH powders were used as starting materials to prepare barium hexaferrite hydrothermally. Since strontium hexaferrite and lanthanum-doped calcium hexaferrite have coercivities similar to that of barium ferrite, the hydrothermal synthesis of strontium hexaferrite and lanthanum-doped calcium hexaferrite were also explored. The reaction products obtained with the various starting materials are described. Electron micrographs showed that alpha -Fe/sub 2/O/sub 3/, gamma -Fe/sub 2/O/sub 3/, or alpha -FeOOH dissolved in the solution first, and then barium hexaferrite nucleated and grew from the solution.>
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Lin et al. (1990) studied this question.
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