Improved properties of BaFe12O19 prepared by ammonium nitrate melt technique and washed in HCl

Topal U., Ozkan H., Topal K. G.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.422, ss.276-278, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 422
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.jallcom.2005.11.043
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.276-278
  • Anahtar Kelimeler: permanent magnets, chemical synthesis, magnetization, magnetic measurements, barium ferrites, MAGNETIC-PROPERTIES, SOL-GEL, NANOPARTICLES, STOICHIOMETRY
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

We have synthesized BaFe12O19 samples by ammonium nitrate melt technique (ANMT) at temperatures from 850 to 1200 degrees C. Calcinations at 850-1000 degrees C yield single domain grains having reasonably high coercive fields up to 4500 Oe. Higher temperature calcinations decrease the coercive fields due to multi-domain grain growth. Washing the samples in HCl is effective to reduce the impurities, especially the antiferromagnetic BaFe2O4. HCl-washing increases magnetization by about 50%; the saturation magnetization increases from 36-45 to 58-62 emu/g and the residual magnetization from 21-26 to 32-34 emu/g. (c) 2005 Elsevier B.V. All rights reserved.