Journal of Superconductivity and Novel Magnetism

, Volume 28, Issue 4, pp 1395–1404 | Cite as

Effect of Annealing Temperature and Boron Addition on Magnetic Properties of Hexaferrites Synthesized by Standard Ceramic Method

Original Paper


The barium and strontium hexaferrites (BaM and SrM) were successfully prepared by the standard solid-state reaction method. To inhibit crystal growth, 1 wt % B2O3 was added into the initial mixture. The structural and magnetic properties of pure hexaferrites were compared with the samples prepared with boron addition. Powders were annealed at temperatures between 800 and 1200 C. The crystal structure, morphology, and magnetic properties of hexaferrites were investigated with X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). BaM was synthesized at temperatures as low as 800 C with boron addition having saturation magnetization of ∼50 emu/g and coercivity of ∼3 kOe. At the same temperature, pure sample has very low magnetization about 1.3 emu/g. Moreover, at higher sintering temperatures, boron-containing samples have higher magnetization values compared to pure BaM. The optimal Fe/Ba ratio was determined as 10.5 for boron-containing samples, while it is 11.5 for the pure one. The coercivity started to decrease at 1100 C indicating that single to multi-domain transition occurs. The saturation magnetization values are nearly equal in pure- and boron-containing SrM samples in the whole temperature range. However, maximal coercivities occurred at different temperatures for boron-containing and the pure samples as 1000 and 1100 C, respectively. Magnetic interactions deduced from the Stoner–Wohlfarth model using the isothermal magnetization and demagnetization measurements showed that boron addition suppresses the destructive (demagnetizing-like) interactions among domains in both SrM and BaM samples, and thus, stabilizes the remanence.


Hexaferrites Magnetic properties Boron addition Stoner–Wohlfarth model 



This work is supported by TUBITAK (the Scientific and Technological Research Council of Turkey) with Project Number 213M174.


  1. 1.
    Xie, T., Xu, L., Liu, C.: Synthesis and properties of composite magnetic material SrCoxFe12-xO19 (x  = 0–0.3). Powder Technol. 232(0), 87–92 (2012)CrossRefGoogle Scholar
  2. 2.
    Jean, M., et al.: Synthesis and characterization of SrFe12O19 powder obtained by hydrothermal process. J. Alloys Compd. 496(1–2), 306–312 (2010)CrossRefGoogle Scholar
  3. 3.
    Sözeri, H., Baykal, A., Ünal, B.: Low-temperature synthesis of single-domain Sr-hexaferrite particles by solid-state reaction route. Phys. Status Solidi (a) 209(10), 2002–2013 (2012)CrossRefADSGoogle Scholar
  4. 4.
    Pramanik, N.C., et al.: Development of nanograined hexagonal barium ferrite thin films by sol–gel technique. Mater. Lett. 59(4), 468–472 (2005)CrossRefGoogle Scholar
  5. 5.
    Le Breton, J.-M., et al.: Structural analysis of co-precipitated Sr1−xLaxFe12−xCoxO19 powders. J. Magn. Magn. Mater. 272–276, Part 3(0), 2214–2215 (2004)CrossRefGoogle Scholar
  6. 6.
    Zaitsev, D.D., et al.: Preparation of the SrFe12O19-based magnetic composites via boron oxide glass devitrification. J. Magn. Magn. Mater. 301(2), 489–494 (2006)CrossRefADSGoogle Scholar
  7. 7.
    Bish, D.L., Howard, S.A.: Quantitative phase analysis using the Rietveld method. J. Appl. Crystallogr. 21(2), 86–91 (1988)CrossRefGoogle Scholar
  8. 8.
    Thompson, G.K., Evans, B.J.: The structure–property relationships in M-type hexaferrites: Hyperfine interactions and bulk magnetic properties. J. Appl. Phys. 73(10), 6295–6297 (1993)CrossRefADSGoogle Scholar
  9. 9.
    Mariño-Castellanos, P.A., Somarriba-Jarque, J.C., Anglada-Rivera, J.: Magnetic and microstructural properties of the BaFe(12−(4/3)x)SnxO19 ceramic system. Phys. B Condens. Matter 362(1–4), 95–102 (2005)CrossRefADSGoogle Scholar
  10. 10.
    Wejrzanowski, T., et al.: Quantitative methods for nanopowders characterization. Appl. Surf. Sci. 253 (1), 204–208 (2006)CrossRefADSGoogle Scholar
  11. 11.
    Solanki, N., Packiaraj, G., Jotania, R.B.: Effect of heat treatment on structural, magnetic and electric properties of Z-type barium cobalt hexaferrite powder. In: Advanced Materials Research 2014, pp. 24–29Google Scholar
  12. 12.
    Zhong, W., et al.: Key step in synthesis of ultrafine BaFe12O19 by sol–gel technique. J. Magn. Magn. Mater. 168(1–2), 196–202 (1997)CrossRefADSGoogle Scholar
  13. 13.
    Li, Y., Wang, Q., Yang, H.: Synthesis, characterization and magnetic properties on nanocrystalline BaFe12O19 ferrite. Curr. Appl. Phys. 9(6), 1375–1380 (2009)CrossRefADSMathSciNetGoogle Scholar
  14. 14.
    Xu, G., et al.: Influence of pH on characteristics of BaFe12O19 powder prepared by sol–gel auto-combustion. J. Magn. Magn. Mater. 301(2), 383–388 (2006)CrossRefADSGoogle Scholar
  15. 15.
    Mali, A., Ataie, A.: Influence of Fe/Ba molar ratio on the characteristics of Ba-hexaferrite particles prepared by sol–gel combustion method. J. Alloys Compd. 399(1–2), 245–250 (2005)CrossRefGoogle Scholar
  16. 16.
    Janasi, S.R., et al.: Magnetic properties of coprecipitated barium ferrite powders as a function of synthesis conditions. Magn. IEEE Trans. 36(5), 3327–3329 (2000)CrossRefADSGoogle Scholar
  17. 17.
    Liu, X., et al.: Improving the magnetic properties of hydrothermally synthesized barium ferrite. J. Magn. Magn. Mater. 195(2), 452–459 (1999)CrossRefADSGoogle Scholar
  18. 18.
    Pullar, R.C., Bhattacharya, A.K.: Crystallisation of hexagonal M ferrites from a stoichiometric sol–gel precursor, without formation of the α-BaFe2O4 intermediate phase. Mater. Lett. 57(3), 537–542 (2002)CrossRefGoogle Scholar
  19. 19.
    Sözeri, H., et al.: Preparation of high quality, single domain BaFe12O19 particles by the citrate sol–gel combustion route with an initial Fe/Ba molar ratio of 4. Mater. Sci. Eng. B 177(12), 949–955 (2012)CrossRefGoogle Scholar
  20. 20.
    Sözeri, H., Küçük, İ., Özkan, H.: Improvement in magnetic properties of La substituted BaFe12O19 particles prepared with an unusually low Fe/Ba molar ratio. J. Magn. Magn. Mater. 323(13), 1799–1804 (2011)CrossRefADSGoogle Scholar
  21. 21.
    Liu, W.-T., Wu, J.-M.: The effect of the vacuum extraction and the Fe/Ba ratio on the phase formation of barium ferrite thin film synthesized by sol–gel method. Mater. Chem. Phys. 69(1–3), 148–153 (2001)CrossRefGoogle Scholar
  22. 22.
    Sürig, C., Hempel, K.A., Sauer, C.: Influence of stoichiometry on hexaferrite structure. J. Magn. Magn. Mater. 157–158, 268–269 (1996)CrossRefGoogle Scholar
  23. 23.
    Wohlfarth, E.P.: Relations between different modes of acquisition of the remanent magnetization of ferromagnetic particles. J. Appl. Phys. 29(3), 595–596 (1958)CrossRefADSGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Z. Mehmedi
    • 1
    • 2
    • 3
  • H. Sözeri
    • 1
  • U. Topal
    • 1
  • A. Baykal
    • 2
    • 3
  1. 1.TUBITAK-UMENational Metrology InstituteGebze-KocaeliTurkey
  2. 2.Department of ChemistryFatih UniversityB.Çekmece-IstanbulTurkey
  3. 3.Department of BioNano Technology EngineeringFatih UniversityB.Çekmece-IstanbulTurkey

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