TY - JOUR
T1 - Nanocrystallization process in Finemet-type alloys followed by in situ 57Fe Mössbauer spectroscopy
AU - Rodríguez, V. A.Peña
AU - Regalado, J. Flores
AU - Baggio-Saitovitch, E.
AU - Passamani, E. C.
N1 - Funding Information:
The authors are indebted to the group of Prof. Dr. A. Conde for sample supplies. This work was partially supported by the CONCYTEC of the Peruvian Government, by CNPq (PCI-program) of the Brazilian Government and by the Latin American Center of Physics. E. Baggio-Saitovitch thanks FAPERJ for the support as Cientista do Nosso Estado.
PY - 2004/10/6
Y1 - 2004/10/6
N2 - High-temperature in situ 57Fe Mössbauer spectroscopy was used to investigate the nanocrystallization process in Fe73.5Si 13.5B9Cu1Nb1X2 (X=Zr, Nb, Mo and V) amorphous alloys. The Mössbauer spectra were taken at temperatures where only the amorphous phase is found in a paramagnetic state, allowing an accurate resolution between the amorphous and crystalline phases presented in the annealed ribbons. The Johnson-Mehl-Avrami theory was used to describe the increase of the crystalline fraction (in vol.%) as a function of the annealing time. The volume fraction of the iron-silicate nanocrystalline phase, found in each of the alloys annealed under similar conditions, increases in the sequence Zr<Nb<Mo<V. The value of the Avrami exponent, determined for each alloy, is near 1, indicating a controlled diffusion process with a nucleation rate close to zero. An activation energy of 3eV was found for the studied alloys.
AB - High-temperature in situ 57Fe Mössbauer spectroscopy was used to investigate the nanocrystallization process in Fe73.5Si 13.5B9Cu1Nb1X2 (X=Zr, Nb, Mo and V) amorphous alloys. The Mössbauer spectra were taken at temperatures where only the amorphous phase is found in a paramagnetic state, allowing an accurate resolution between the amorphous and crystalline phases presented in the annealed ribbons. The Johnson-Mehl-Avrami theory was used to describe the increase of the crystalline fraction (in vol.%) as a function of the annealing time. The volume fraction of the iron-silicate nanocrystalline phase, found in each of the alloys annealed under similar conditions, increases in the sequence Zr<Nb<Mo<V. The value of the Avrami exponent, determined for each alloy, is near 1, indicating a controlled diffusion process with a nucleation rate close to zero. An activation energy of 3eV was found for the studied alloys.
KW - Amorphous materials
KW - Clusters
KW - Magnetically ordered materials
KW - Mössbauer spectroscopy
KW - Nanostructures
UR - http://www.scopus.com/inward/record.url?scp=4644327758&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2004.02.023
DO - 10.1016/j.jallcom.2004.02.023
M3 - Artículo
AN - SCOPUS:4644327758
SN - 0925-8388
VL - 379
SP - 23
EP - 27
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -