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Phase formation, magnetic properties, and phase stability in reducing atmosphere of M-type strontium hexaferrite nanoparticles synthesized via a modified citrate process

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Abstract

Nanosize Sr-hexaferrite particles (SrM) were synthesized via a citrate-based sol–gel route, and the details of the calcination reaction conditions were investigated. Thermal decomposition of a citrate precursor proceeds in a two-step process: at low temperature T1 the precursor decomposes into maghemite and Sr carbonate, and transforms into hexaferrite upon a second treatment at another temperature T2. A synthesis protocol with T1 = 350 °C and T2 = 650 °C gives hexaferrite particles with size of below 100 nm. A systematic study of reaction conditions revealed that the formation of a hematite-free decomposition product at T1 is the prerequisite for the synthesis of single-phase hexaferrite nanosize particles. The hexaferrite particles exhibit a saturation magnetization at room temperature of Ms = 58 emu/g with a coercivity of Hc = 3.7 kOe. Further fine-milling of the as-synthesized ferrite in aqueous media gives particles below 50 nm in size with Ms = 48–54 emu/g and Hc = 4.2–5.5 kOe under preservation of the M-type structure. The thermal stability of SrM particles under reducing conditions at moderate temperature was also studied. Annealing of ferrite particles in Ar/5%H2 atmosphere at 350 °C results in magnetite formation; iron is formed at T ≥ 450 °C after complete hexaferrite decomposition; hence, SrM@Fe nanocomposites are not accessible via particle reduction of SrM particles.

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References

  1. Smith J, Wijn HPJ (1959) Ferrites Philips Technische Bibliothek. Centrex, Eindhoven

    Google Scholar 

  2. Kojima H (1982) Hexagonal Ferrites. In: Wohlfarth EP (ed) Ferromagnetic materials, vol 3. North-Holland Publ, Amsterdam, pp 305–391

    Google Scholar 

  3. Pullar R (2012) Hexagonal ferrites: a review of the synthesis, properties and applications of hexaferrite ceramics. Progr Mater Sci 57:1191–1334

    Article  CAS  Google Scholar 

  4. Went JJ, Rathenau GW, Gorter EW, van Oosterhout GW (1952) Ferroxdure, eine Gruppe neuer Werkstoffe für Dauermagnete. Philips Technische Rundschau 13:361–376 (in German)

    Google Scholar 

  5. Kneller EF, Hawig R (1991) The exchange spring magnet: a new material principle for permanent magnets. IEEE Trans Magn 27:3588–3600

    Article  CAS  Google Scholar 

  6. Poudyal N, Liu JP (2013) Advances in nanostructured permanent magnets research. J Phys D Appl Phys 46:043001

    Article  Google Scholar 

  7. Roy D, Shivakumara C, Anil Kumar PS (2009) Observation of the exchange spring behaviour in hard-soft ferrite nanocomposites. J Magn Magn Mater 321:L11–L14

    Article  CAS  Google Scholar 

  8. Jenus P, Topole M, Mc Guiness P, Granados-Miralles C, Stingaciu M, Christensen M, Kobe S, Rozman KZ (2016) Ferrite-based exchange coupled hard-soft magnets fabricated by spark plasma sintering. J Am Ceram Soc 99:1927–1934

    Article  CAS  Google Scholar 

  9. Cullity BD, Graham CD (2009) Introduction to magnetic materials, 2nd edn. Wiley, Hoboken

    Google Scholar 

  10. Rezlescu L, Rezlescu E, Popa PD, Rezlescu N (1999) Fine barium hexaferrite powder prepared by the crystallisation of glass. J Magn Magn Mater 193:288–290

    Article  CAS  Google Scholar 

  11. Gadalla AM, Hennicke HW (1975) Formation of barium hexaferrite. J Magn Magn Mater 1:144–152

    Article  CAS  Google Scholar 

  12. Haneda K, Kojima H (1974) Effect of milling on the intrinsic coercivity of barium ferrite powders. J Am Ceram Soc 57:68–71

    Article  CAS  Google Scholar 

  13. Mohsen Q (2010) Barium hexaferrite synthesis by oxalate precursor route. J Alloys Compd 500:125–128

    Article  CAS  Google Scholar 

  14. Prashkova EV, Solovyova ED, Kolodiazhnyi TV, Ivanitskii VP, Belous AG (2014) Effect of heat treatment on the phase composition, structure and magnetic properties of M-type barium hexaferrite. J Magn Magn Mater 368:1–7

    Article  Google Scholar 

  15. Cabanas MV, Gonzales-Calbet JM, Labeau M, Mollard P, Pernet M, Vallet-Regi M (1992) Evolution of the microstructure and its influence on the magnetic properties of aerosol synthesized BaFe12O19 particles. J Solid State Chem 101:265–274

    Article  CAS  Google Scholar 

  16. Markovec D, Primc D, Sturm S, Kodre A, Hanzel A, Drofenik M (2012) Structural properties of ultrafine Ba-hexaferrite nanoparticles. J Solid State Chem 196:63–71

    Article  Google Scholar 

  17. Sankaranarayanan VK, Pankhurst QA, Dickson DPE, Johnson CE (1993) Ultrafine particles of barium ferrite from a citrate precursor. J Magn Magn Mater 120:73–75

    Article  CAS  Google Scholar 

  18. Vijayalakshmi A, Gajbhiye NS (1998) Magnetic properties of single-domain SrFe12O19 particles synthesized by citrate precursor technique. J Appl Phys 83:400–406

    Article  CAS  Google Scholar 

  19. Yu HF, Liu PC (2006) Effects of pH and calcination temperatures on the formation of citrate derived hexagonal barium ferrite particles. J Alloys Compd 416:222–227

    Article  CAS  Google Scholar 

  20. Sapoletova NA, Kushnir SE, Li YH, An SY, Seo JW (2015) Plate-like SrFe12O19 particles prepared by modified sol–gel method. J Magn Magn Mater 389:101–105

    Article  CAS  Google Scholar 

  21. Zhong W, Ding W, Jiang Y, Zhang N, Du Y, Yan Q (1997) Preparation and magnetic properties of barium hexaferrite nanoparticles produced by the citrate process. J Am Ceram Soc 80:3258–3262

    Article  CAS  Google Scholar 

  22. Alamolhoda S, Seyyed Ebrahimi SA, Badiei A (2006) Optimization of the Fe/Sr ratio in processing of ultrafine strontium hexaferrite powders by a sol–gel autocombustion method. Phys Met Metallogr 102:S71–S73

    Article  Google Scholar 

  23. Zhang J, Rong LX, Dong BZ (2003) SAXS study on the microstructure of Fe2O3 nanocrystal. Mater Sci Eng A351:224–227

    Article  CAS  Google Scholar 

  24. Mürbe J, Rechtenbach A, Töpfer J (2008) Synthesis and physical characterization of magnetite nanoparticles for biomedical applications. Mater Chem Phys 110:426–433

    Article  Google Scholar 

  25. Huang J, Zhuang H, Li W (2003) Synthesis and characterization of nanocrystalline BaFe12O19 powders by low temperature combustion. Mater Res Bull 38:149–159

    Article  CAS  Google Scholar 

  26. Socrates G (2004) Infrared and Raman characteristic group frequencies: tables and charts, 3rd edn. Wiley, Chichester

    Google Scholar 

  27. Bellotto M, Busca G, Cristiani C, Groppi G (1995) FT-IR skeletal powder spectra of Ba-β-aluminas with compositions BaAl9O14.5, BaAl12O19 and BaAl14O22 and of Ba-Ferrite, BaFe12O19. J Solid State Chem 117:8–15

    Article  CAS  Google Scholar 

  28. Kaczmarek WA, Ninham BW (1995) Surfactant-assisted ball milling of BaFe12O19 ferrite dispersion. Mater Chem Phys 40:21–29

    Article  CAS  Google Scholar 

  29. Primc D, Makovec D (2015) Composite nanoplatelets combining soft-magnetic iron oxide with hard-magnetic barium hexaferrite. Nanoscale 7:2688–2697

    Article  CAS  Google Scholar 

  30. Pfeiffer H, Schüppel W (1990) Investigation of magnetic properties of barium ferrite powders by remanence curves. Phys Status Solidi (a) 119:259–269

    Article  CAS  Google Scholar 

  31. Zi ZF, Sun YP, Zhu XP, Yang ZR, Dai JM, Song WH (2008) Structural and magnetic properties of SrFe12O19 hexaferrite synthesized by a modified chemical co-precipitation method. J Magn Magn Mater 320:2746–2751

    Article  CAS  Google Scholar 

  32. Quesada A, Rubio-Marcos F, Marco JF, Mompean FJ, Garcia-Hernandez M, Fernandez JF (2014) On the origin of remanence enhancement in exchange-uncoupled CoFe2O4-based composites. Appl Phys Lett 105:202405

    Article  Google Scholar 

  33. Kitahata SI (1997) Magnetic properties and crystal structure of composite Ba-ferrite particles containing α-Fe. Jpn J Appl Phys 36:676–683

    Article  CAS  Google Scholar 

  34. Hessien MM, Radwan M, Rashad MM (2007) Enhancement of magnetic properties for barium hexaferrite prepared through ceramic route. J Anal Appl Pyrolysis 78:282–287

    Article  CAS  Google Scholar 

  35. Pal M, Bid S, Pradham SK, Nath BK, Das D, Chakravorty D (2004) Synthesis of nanocomposites comprising iron and barium hexaferrites. J Magn Magn Mater 269:42–47

    Article  CAS  Google Scholar 

  36. Li J, Gür TM, Sinclair R, Rosenblum SS, Hayashi H (1994) Thermochemical stability of BaFe12O19 and BaFe2O4 and phase relations in the Ba–Fe–O ternary system. J Mater Res 9:1499–1512

    Article  CAS  Google Scholar 

  37. Rakshit SK, Parida SC, Singh Z, Prasad R, Venugopal V (2004) Thermodynamic properties of ternary oxides in the system Ba–Fe–O using solid-state electrochemical cells with oxide and fluoride ion conducting electrolytes. J Solid State Chem 177:1146–1156

    Article  CAS  Google Scholar 

Download references

Acknowledgements

The authors acknowledge financial support from the Federal Ministry of Research and Education, Germany, through Grant 03X3582D. We thank Dr. H.-J. Hempel for TEM microscopy (University Jena, Germany).

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Authors and Affiliations

  1. Department of SciTec, University of Applied Sciences Jena, C.-Zeiss-Promenade 2, 07745, Jena, Germany

    Carmen Bohlender, Marcel Kahnes & Jörg Töpfer

  2. Leibniz Institute of Photonic Technology, 07745, Jena, Germany

    Robert Müller

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  1. Carmen Bohlender
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  2. Marcel Kahnes
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  4. Jörg Töpfer
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Correspondence to Jörg Töpfer.

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Bohlender, C., Kahnes, M., Müller, R. et al. Phase formation, magnetic properties, and phase stability in reducing atmosphere of M-type strontium hexaferrite nanoparticles synthesized via a modified citrate process. J Mater Sci 54, 1136–1146 (2019). https://doi.org/10.1007/s10853-018-2916-x

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