Fe/Ba Ratio Effect on Magnetic Properties of Barium Ferrite Powders Prepared by Microwave-Induced Combustion

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概要

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• Barium ferrite powders were successfully synthesized by microwave-induced combustion. The magnetic properties of barium ferrite powders with various Fe/Ba ratios varying from 11 to 12 annealed at various temperatures in the range of 850–1050°C were determined. The resultant powders were investigated by X-ray diffractometer (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), differential thermal analyzer/thermogravimeter (DTA/TG), and surface area measurement. Microwave-heated barium ferrite with an Fe/Ba ratio of 11 and annealed at 1000°C for 2 h exhibited optimum magnetic properties for magnetic recording applications, a saturation magnetization of 66 emu/g and an intrinsic coercive force of 2100 Oe. The microwave-heated barium ferrite powders with various Fe/Ba ratios annealed at various temperatures had particles size ranging from 40 to 90 nm. Thus, the fine control of crystal growth by varying the annealing temperature can be exploited for the production of fine magnetic powders of various sizes for a variety of practical applications.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2003-05-15

著者

• Pan Ko-ying

  Department Of Materials Science And Engineering National Tsing-hua University

• Lin Cheng-hsiung

  Department Of Chemical Engineering Wu-feng Institute Of Technology

• Fu Yen-pei

  Department Of Materials Science And Engineering National Dong Hwa University

• Lin Cheng-Hsiung

  Department of Chemical Engineering, Wu-Feng Institute of Technology, Ming-Hsiung, Chiayi, Taiwan 621, R.O.C.

• Fu Yen-Pei

  Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu, Taiwan 300, R.O.C.

• Pan Ko-Ying

  Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu, Taiwan 300, R.O.C.

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