Low-temperature sintering of M-type barium ferrite with BaCu(B2O5) additive

► The BaCu(B2O5) can lower the sintering temperature of barium ferrite. ► Crystallization of BaFe12O19 was speeded up by the BaCu(B2O5) liquid phase. ► Proper BaCu(B2O5) liquid phase make the saturation magnetization (Ms) increase, once its excess, leading to degradation in Ms.