Iron was oxidized in the Fe-Ba(OH)2-NaOH-H2O-O2 system at elevated temperatures. Fe3O4 and α-FeOOH were formed in the absence of oxygen. On the other hand, hexagonal plate-like particles of BaFe12O19, 1.0–4.3 μm diameter, were formed as single phase by the oxidation of iron in Ba(OH)2 and NaOH mixed solutions at 250–300°C and above 1.0 MPa oxygen. The diameter of the particle significantly depended on the NaOH concentration. Additives such as CO32−, SO42− and CH3COO− promoted the grain growth of BaFe12O19.
Oxidation Iron Fe3O4 Hexagonal Barium
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