Phase structure of the nanocrystalline Nd2Fe14B/alfa-Fe magnets with different grain

• Autorzy: Wnuk I. , Wysłocki J. , Przybył A.
• Konferencja: Proceedings of the All-Polish Seminar on Mössbauer Spectroscopy OSSM'06, June 18-21, 2006, Koszęcin, Poland
• Języki publikacji: EN

Abstrakty

EN

The effect of the contents of the magnetically hard and magnetically soft phases on the magnetic properties of Nd2Fe14B + alfa-Fe nanocrystalline magnets, as produced by the method of mechanical alloying, has been established. The phase composition of specimens was determined using X-ray diffractometry and Mössbauer spectroscopy. The Mössbauer examination showed that as the powder milling times increased, the content of the Nd2Fe14B phase increased from 42.8% (after the milling time of 10 h, with a grain size of 44.8 nm) to 66.3% (after the milling time of 48 h, with a grain size of 37.3 nm) and then decreased to 40.3% after 120 h of milling. On the other hand, the content of the magnetically soft phase alfa-Fe initially decreased (from 27.7%), reaching a minimum after the milling time of 48 h (17.4%) and then increasing to 36.9% after 120 h of milling.

Słowa kluczowe

EN

Nd2Fe14B + alfa-Fe nanocrystalline magnets; Mössbauer spectroscopy; magnetic properties

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2007
• Tom: Vol. 52, supl. 1
• Strony: 85--88
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Wnuk I.

autor

Wysłocki J.

autor

Przybył A.

• Institute of Physics, Department of Materials Processing Technology and Applied Physics, Częstochowa University of Technology, 19 Armii Krajowej Str., 42-200 Częstochowa, Poland, Tel./Fax: [phone],

Bibliografia

• 1. Fidler J, Schrefl T (1998) Micromagnetic calculation of the limits of composite Nd2Fe14B/α-Fe, Fe3B, Fe23B6 magnets. In: Proc on 10th Int Symp on Magnetic Anisotropy and Coercivity in Rare Earth-Transition Metal Alloys, Dresden, Germany: 267−276
• 2. Givord D, Li HS, Tasset F (1985) Polarized neutron study of the compounds Y2Fe14B and Nd2Fe14B. J Appl Phys 57:4100−4103
• 3. Herbst JF, Croat JJ (1991) Neodymium-iron-boron permanent magnets. J Magn Magn Mater 101:360−362
• 4. Herbst JF, Croat JJ, Yelon WB (1985) Structural and magnetic properties of Nd2Fe14B. J Appl Phys 57:4086−4090
• 5. Kaszuwara W (2003) Role of chemical composition and processing method in the tailoring of properties of nanocrystalline RE-M magnets. Oficyna Wydawnicza Politechniki Warszawskiej, Warszawa (in Polish)
• 6. Leonowicz M (1996) Modern hard magnetic materials.Oficyna Wydawnicza Politechniki Warszawskiej, Warszawa (in Polish)
• 7. O’Handley RC (2000) Modern magnetic materials. Principles and applications. John Wiley & Sons, New York
• 8. Rosenberg M, Deppe P, Wójcik M (1985) An NMR and Mössbauer study of Nd2Fe14B. J Appl Phys 57:4124−4126
• 9. Sagawa M, Hirosawa S, Yamamoto H, Fujimura S, Matsuura Y (1987) Nd-Fe-B permanent magnet materials. Jpn J Appl Phys 26:785−800
• 10.Schneider G, Henig E, Stadelmayer HH, Petzow G (1986) Horizons of powder metalurgy. In: Proc Int Powder Met Conf and Exhibition: “The future of powder metallurgy”, Düsseldorf, Germany: 1197