Abstract
Hexagonal M-type BaFe12O19 ferrites were synthesized via a hydrothermal method with Ba/Fe ratio from 1:12 to 1:7 in the raw materials, and their structure and magnetic properties are studied. When the Ba/Fe ratio is smaller than 1:9, the impurity α-Fe2O3 and BaFe2O4 can be found in the as-synthesized specimens, and it seems hard to avoid the formation of impurity BaCO3 during a hydrothermal process. The grain size of as-synthesized specimens decreases obviously with the increase of Ba/Fe ratio. The phase composition and morphology affect the magnetic properties of specimens markedly. In addition, it is found that the acid washing can improve the magnetic properties of specimens.
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