Morphology and magnetic properties of pressed barium hexaferrite BaFe12O19 materials

D. A. Vinnik, A. S. Chernukha, S. A. Gudkova, V. E. Zhivulin, E. A. Trofimov, A. Yu Tarasova, D. A. Zherebtsov, M. Kalandija, A. V. Trukhanov, S. V. Trukhanov, A. V. Senin, L. I. Isaenko, N. S. Perov, R. Niewa

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Barium hexaferrite tablets were compacted at pressures of 50-149 kN/cm2 and subsequently calcined at different temperatures up to 1350 °C for various durations. The compaction pressure has a non-monotonic influence on the calcined sample density and coercivity. The apparent density shows a maximum concomitant to a minimum in coercivity near a compaction pressure of 120 kN/cm2. In contrast the Curie temperature of 459 °C are not influenced by the compaction pressure. The optimized compaction pressure and subsequent calcination temperature for obtaining high-density single phase material is inferred to 108 kN/cm2 and 1350 °C, respectively. The resulting pellets show surfaces of two different sized crystallites in the 3-10 μm and 50-150 μm ranges and grains with cheese-like pores of 5-7 μm in the interior. The interior grain size increases with compaction pressure to up to 150-250 μm, while the pore size stays unaffected.

Original languageEnglish
Pages (from-to)131-135
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume459
DOIs
Publication statusPublished - 1 Aug 2018

Keywords

  • Calcination
  • Ferrites
  • Magnetization
  • Pelletizing
  • Permanent magnets
  • OXIDE
  • PARTICLES
  • IONS
  • BAND
  • MICROWAVE ABSORBER
  • SINGLE-CRYSTALS
  • EVOLUTION
  • CERAMIC METHOD
  • GROWTH
  • THIN

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