The topochemical sintering of barium hexaferrite utilizing stoichiometric mixtures of BaCO3and αFe2O3/α-FeOOH raw materials has been investigated. The densification behaviour of BaO.6Fe2O3in the temperature range of 1273 to 1573 K is studied with the help of a dilatometer. The nonisothermal dcnsification kinetics is derived from dilatometrie results. A kinetic relation of the type mentioned in the equation In