Finding optimal Fe/Ba ratio to obtain single phase BaFe12O19 prepared by ammonium nitrate melt technique

Topal U., Ozkan H., Dorosinskii L.

JOURNAL OF ALLOYS AND COMPOUNDS, vol.428, pp.17-21, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 428
  • Publication Date: 2007
  • Doi Number: 10.1016/j.jallcom.2006.03.047
  • Journal Name: JOURNAL OF ALLOYS AND COMPOUNDS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.17-21
  • Keywords: permanent magnets chemical synthesis, magnetization, magnetic measurements, barium ferrites, BaFe12O19, Fe/Ba ratio, MAGNETIC-PROPERTIES, BARIUM FERRITE, SOL-GEL, HEXAFERRITE, POWDERS, CRYSTALLIZATION, NANOPARTICLES, STOICHIOMETRY
  • Middle East Technical University Affiliated: No

Abstract

In the present work, the magnetic properties and the phase composition of barium ferrite BaFe12O19 powders prepared by the ammonium nitrate melt technique with Fe/Ba ratios varying from 2 to 13 was investigated. We observed that BaFe2O4 phase is formed at low values of Fe/Ba ratios (2-6) and alpha-Fe2O3 phase is formed at high values of Fe/Ba ratio as secondary phases. BaFe2O4 phase could be easily eliminated from the structure by washing the annealed powders with diluted HCI.HCI-washing is not effective for the elimination of alpha-Fe2O3 phase. Consequently, we succeed to obtain high quality single phase BaFe12O19 Powders at low Fe/Ba ratios. Highest specific saturation magnetization M, of the powders with Fe/Ba ratio of 2 was determined to be 66.7 emu/g. (c) 2006 Elsevier B.V. All rights reserved.