FERROMAGNETIC RESONANCE STUDY OF AMORPHOUS AND NANOCRYSTALLINE Fe81B13.5Si3.5C2 RIBBONS

Autor:	P. Winotai, Weeraphat Pon-On, I-Ming Tang
Rok vydání:	2009
Předmět:	Materials science Annealing (metallurgy) Analytical chemistry Nucleation Statistical and Nonlinear Physics Condensed Matter Physics Ferromagnetic resonance Nanocrystalline material Amorphous solid law.invention Nuclear magnetic resonance law Mössbauer spectroscopy Ribbon Crystallization
Zdroj:	International Journal of Modern Physics B. 23:3391-3402
ISSN:	1793-6578 0217-9792
DOI:	10.1142/s0217979209052996
Popis:	The nanocrystallization process in amorphous Fe 81 B 13.5 Si 3.5 C 2 ribbons caused by isothermal annealing below the crystallization temperature is studied. X-ray diffraction and Mossbauer spectroscopy measurements are used to identify the formation of new Fe containing compounds such as the ribbons annealed at various temperatures. The ferromagnetic resonance measurements for an as-cast ribbon and the 495°, 525°C and 600°C annealed ribbons exhibit a resonance line at 63.64 mT for φ = 0°. The sample annealed at 425°C shows two resonance peaks at 95.45 mT and 295.46 mT. These are due to the nanocrystalline α– Fe(Si) phase. The resonance-line widths are seen to broaden after the ribbons are annealed at 495°C and 525°C, at which time, the amorphous matrix crystallizes into nano-grains of α– Fe(Si) , t– Fe 2 B and t– Fe 3 B phases. The kinetics of the crystallization is discussed in terms of the relative change in the line width of the samples annealed at 495°C for different annealing times. These results yielded an Avrami exponent, n of 0.84 which is consistent with diffusion-controlled growth with a nucleation rate close to zero.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1d9cec2f3f2f45e4a2d668bd779be30c https://doi.org/10.1142/s0217979209052996 Zobrazit plný text záznamu