High-Resolution Transmission Electron Microscopy Studies of Sol–Gel-Derived Cobalt-Substituted Barium Ferrite
✍ Scribed by Geok B. Teh; David A. Jefferson
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 198 KB
- Volume
- 167
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Nanocrystal specimen of cobalt (II)-doped magnetoplumbite (M-type) BaFe 12 O 19 were synthesized via a sol-gel method using ethylene glycol as precursor. Hexagonal-like platelets and other morphologies of ferrites were obtained at the final stage of annealing process. The specimens were characterized using X-ray diffraction, SQUID magnetometry measurement and high-resolution transmission electron microscopy. The saturation magnetization of the specimen at 300 K was found to be greatly reduced from 48 (3) emu/g in parent ferrite to 28 (3) emu/g in the doped ferrite. A total reduction of 74% in the value of intrinsic coercivity was recorded, 276 (15) G from the doped ferrite compared to 1080 (54) G in the parent ferrite.