Barium ferrite powders prepared by microwave-induced combustion process and some of their properties

Barium ferrite powders were successfully synthesized by a microwave-induced combustion process. The process takes only a few minutes to obtain calcined barium ferrite powders. The resultant powders were investigated by XRD, SEM, VSM, TG/DTA, and a surface area measurement. The as-received product shows the barium ferrite with saturation magnetization (M-s) approximate to 23 emu/g and an intrinsic coercive force (H-i(c)) of 595 Oe, whereas upon annealing at 1000degreesC for 2 h, the saturation magnetization (M-s) increases to 66 emu/g and the intrinsic coercive force (H-i(c)) reaches 2100 Oe. (C) 2003 Elsevier B.V. All rights reserved.