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Structural and magnetic characterization of the Nd2Fe14B + 10%wt.Fe system subjected to high-energy milling

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Abstract

We have investigated exchange-spring magnets made from powders prepared by high-energy milling Nd2Fe14B mixed with 10%wt. Fe, milled for 6 h in a planetary mill, varying the rotation velocity and the starting grain refinement of the soft phase. The samples were characterized by X-ray diffraction, magnetization techniques and 57Fe Mössbauer spectroscopy. The diffractometric and Mössbauer analyses revealed that the Nd2Fe14B compound was partially decomposed in the milling process, increasing the amount of free iron and reducing the grain size of both. Indicative for the Fe2B and Nd1-εFe4B4 phase separation was also found. The magnetization versus applied magnetic field curves showed that both the remanence and coercive field for the 500 rpm milled samples reached values higher than those earlier obtained for un-milled or similarly milled single Nd2Fe14B. However, milling with 600 rpm showed to be deleterious to the same magnetic parameters. It was also demonstrated that milling using iron with less refined grains is more effective to improve the magnetic properties of the composite system.

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References

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

    Article  ADS  Google Scholar 

  2. Skomski, R., Coey, J.M.D.: Giant energy product in nanostructured two-phase magnets. Phys. Rev. B. 48, 15 812–15 816 (1993)

    Article  Google Scholar 

  3. Davies, H.A.: Nanocrystalline exchange-enhanced hard magnetic alloys. J. Magnetism Magnetic Mater. 157/158, 11–14 (1996)

    Article  ADS  Google Scholar 

  4. Mican, S., Hirian, R., Isnard, O., Chicinas, I., Pop, V.: Effect of milling conditions on the microstructure and interphase exchange coupling of Nd2Fe14B/α-Fe nanocomposites. Phys. Procedia. 75, 1314–1323 (2015)

    Article  ADS  Google Scholar 

  5. Pop, V., Gutoui, S., Dorolti, E., Leostean, C., Isnard, O., Chicinas, I., Pana, O.: The influence of milling and annealing on the structural and magnetic behavior of Nd2Fe14B / α -Fe magnetic nanocomposite. J. Alloys Compd. 581, 821–827 (2013)

    Article  Google Scholar 

  6. Talari, M.K., Markandeyulu, G., Prasad Rao, K.: Studies on structural and magnetic properties of ball milled Nd2Fe14B intermetallic powders. Mater. Res. Innov. 15, 26–29 (2011)

    Article  Google Scholar 

  7. Simeonidis, K., Sarafidis, C., Papastergiadis, E., Angelakeris, M., Tsiaoussis, I., Kalogirou, O.: Evolution of Nd2Fe14B nanoparticles magnetism during surfactant-assisted ball-milling. Intermetallics. 19, 589–595 (2011)

    Article  Google Scholar 

  8. Pal, S.K., Shultz, L., Gutfleish, O.: Structural and magnetic properties of heat-treated ultrafine single crystalline Nd2Fe14B particles obtained by ball-milling of dynamic hydrogenation disproportionation desorption and recombination powder. Scr. Mater. 78-79, 33–36 (2014)

    Article  Google Scholar 

  9. Akdogan, N.G., Hadjipanayis, G.C., Sellmyer, D.J.: Novel Nd2Fe14B nanoflakes and nanoparticles for the development of high energy nanocomposite magnets. Nanotechnology. 21, 1–5 (2010)

    Google Scholar 

  10. Rodriguez-Carvajal, J.: FULLPROF: a Program for Rietveld Refinement and Pattern Matching Analysis at the Satellite Meeting on Powder Diffraction of the XV IUCr Congress 127 (1990)

  11. Herbst, J.F., Croat, J.J., Pinkerton, F.E.: Relationships between crystal structure and magnetic properties in Nd2Fe14B. Phys. Rev. B. 29, 4176–4178 (1984)

    Article  ADS  Google Scholar 

  12. Long, G.J., Kulasekere, R., Pringle, O.A., Grandjean, F., Buschow, K.H.J.: A comparison of the Mössbauer effect spectra of R2Fe14B and R2Fe14C. J. Magn. Magn. Mater. 117, 239–250 (1992)

    Article  ADS  Google Scholar 

  13. Grandjean, F., Long, G., Tharp, D., Pringle, O., James, W.: An analysis of the Mössbauer spectra of Nd2Fe14B in terms of a new model. J. Phys. 581–582 (1988)

  14. Niarchos, D., Zouganelis, G., Kostikas, A., Simopoulos, A.: Magnetic properties of the R1+εFe4B4 compounds (R = rare earth) from magnetization and Mössbauer measurements. Solid State Commun. 59, 389–391 (1986)

    Article  ADS  Google Scholar 

  15. Rechenbergt, H.R., Paduan-Filho, A., Missell, F.P., Deppe, P., Rosenberg, M.: Magnetic properties and Mössbauer effect in R5Fe18B18 (R1+εFe4B4). Solid State Commun. 59, 541–543 (1986)

    Article  ADS  Google Scholar 

  16. Murphy, A.K., Hershkowitz, N.: Temperature-dependent hyperfine interactions in Fe2B. Phys. Rev. B. 7, 23–31 (1978)

    Article  ADS  Google Scholar 

  17. Weisman, I.D., Swartzendruber, L.J., Bennett, L.H.: Resonance studies in ferromagnetic Fe2B and Fe2Zr. Phys. Rev. 117, 465–471 (1969)

    Article  ADS  Google Scholar 

  18. Massalski T. B., Binary alloy phase diagrams, American Society for Metals, vol 1 p.3589 (1990)

  19. Yang, C.J., Park, E.B.: Mössbauer study on Nd2Fe14B/Fe3B composite magnet treated by an external magnetic field. J. Magn. Magn. Mater. 168, 278–284 (1997)

    Article  ADS  Google Scholar 

  20. Yamasaki, M., Hamano, M., Kobayashi, T.: Mössbauer study on the crystallization process of α-Fe/Nd2Fe14B type nanocomposite magnet alloy. Mater. Trans. 43, 2885–2889 (2002)

    Article  Google Scholar 

Download references

Acknowledgments

The authors thank CNPq (Edital Universal) grant No 461567 / 2014 – 8.

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Correspondence to Andrea Paesano Jr.

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This article is part of the Topical Collection on Proceedings of the 16th Latin American Conference on the Applications of the Mössbauer Effect (LACAME 2018), 18-23 November 2018, Santiago de Chile, Chile Edited by Carmen Pizarro Arriagada

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de Souza Nunes, G.C., Biondo, V., Ferreira, R.F. et al. Structural and magnetic characterization of the Nd2Fe14B + 10%wt.Fe system subjected to high-energy milling. Hyperfine Interact 240, 20 (2019). https://doi.org/10.1007/s10751-019-1559-x

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