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Ba-ferrite with controlled particle size was synthesized by the hydrothermal attrition mixing, a new method which was a combination of conventional hydrothermal treatment and attrition mixing using balls. Under hydrothermal conditions, attrition mixing influenced the nucleation process in crystallization. The nucleation rate increased with increasing number of balls and/or increasing rotation speed. The Ba-ferrite fine particles thus obtained showed a snake like hysterisis curve, different from Ba-ferrite fine particles synthesized at high temperatures. This is probably due to the lattice distortion enhanced by the OH- ions incorporated during the hydrothermal synthesis.