There are three important methods for manufacturing barium ferrite on an industrial scale: the ceramic, hydrothermal, and glass crystallization methods. The main producers were Toshiba and Toda in 1995. Actual data were not disclosed.
Ceramic Method
Mixtures of barium carbonate and iron oxide react at 1200-1350 °C to produce crystalline agglomerates, which are ground to a particle size ofca. 1 pm. This method is only suitable for the high-coercivity pigments required for magnetic stripes [5.26].