Partic. vol. 2 no. 1 pp. 41-43 (February 2004)
doi: 10.1016/S1672-2515(07)60019-0

Research Note

A novel hydrothermal synthesis method for barium ferrite

Kang Li, Hongchen Gu^*,Qun Wei

hcgu@mail.edu.cn

Abstract

In the present work, fine barium ferrite powder has been synthesized through a one-step hydrothermal process in an autoclave at [OH⁻]/[Cl⁻] ratio of 2:1 in the temperature range from 180 to 260 °C using barium chloride (BaCl₂), ferrous chloride (FeCl₂) and potassium nitrate (KNO₃) as the starting materials. Both particle size and saturation magnetization (M_s) increase with increasing hydrothermal reaction temperature, while the intrinsic coercivity (_iH_c) peaks at 685 Oe at 230 °C. Morphology progress from the barium ferrite precursor particles to the barium hexaferrite particles has been monitored with increasing hydrothermal reaction time at 230 °C in the autoclave.

Keywords

barium hexaferrite; hydrothermal reaction; magnetic recording nanoparticles