Jozefien De Keyzer

Barium – Iron – Oxygen

The first barium ferrite investigated was BaFe12O19 by [1938Ade] who recognized the similarity of its structure with that of the so-called β alumina (Na2O·11Al203) and its isotypy with the mineral known as magnetoplumbite PbFe12O19. The structure of this compound was determined for the first time by [1967Tow] and is in good agreement with more recent studies of [1985Obr, 1992Shi]. The investigation of the Ba-Fe-O ternary system is concerned mainly with the study of BaFe12O19 and related compounds, which have magnetic properties of significant practical importance (Table 1). Barium oxide is also known to stabilize the higher oxidation states of iron, for instance in BaFeO3 in which iron has the valence IV [1970Bel, 1971Zan].