Actas de congresos
Thermal Scanning Studies Of Percolated Fe-cu Granular Alloys
Registro en:
Materials Characterization. , v. 50, n. 02/03/15, p. 123 - 125, 2003.
10445803
10.1016/S1044-5803(03)00078-0
2-s2.0-0141998777
Autor
Socolovsky L.M.
Sanchez F.H.
Institución
Resumen
Fe-Cu alloys produced by mechanical alloying were studied with Mössbauer thermal scanning spectroscopy (MTS). This technique consists in recording Mössbauer effect absorption at a fixed energy while the temperature of the sample is changed. Hyperfine magnetic field behavior can be closely followed. Four mechanically alloyed samples FexCu 100-x with iron concentration x=30, 35, 40, and 45 at.% were studied. Absorption graphs (intensity vs. temperature) are similar for all samples: intensity sharply falls with the increase of the temperature, following the collapse of the sextet lines. This collapse occurs at a very precise temperature, which coincides with a magnetic-nonmagnetic transition line in a former magnetic phase diagram. Conventional Mössbauer spectroscopy confirms the appointed phase change, displaying a doublet at temperatures above the critical. © 2003 Elsevier Inc. All rights reserved. 50 02/03/15 123 125 Uenishi, K., Kobayashi, K., Nasu, S., Hatano, H., Ishihara, K., Shingu, P.H., Mechanical alloying in the Fe-Cu system (1992) Z. Metallkd., 83, p. 132 Socolovsky, L.M., Sánchez, F.H., Yasuna, K., Otsuki, A., Ishihara, K., Shingu, P.H., Mössbauer measurements in GMR system FexCu 100-x prepared by MA (1998) Hyperfine Interact. C, 3, pp. 210-214 Socolovsky, L.M., Sánchez, F.H., Shingu, P.H., Magnetic structure of FexCu100-x magnetoresistive alloys produced by mechanical alloying (2001) Hyperfine Interact., 133, pp. 47-52 Mendoza Zélis, P., Pasquevich, G., Sánchez, F.H., Martínez, N., Veiga, A., A new application of Mössbauer effect thermal scans: Determination of the magnetic hyperfine field temperature dependence (2002) Phys. Lett. A, 298, pp. 55-59 Martínez, N., Mayosky, M., Spinelli, E., Veiga, A., Mendoza Zélis, P., Pasquevich, G., A constant-velocity Mössbauer spectrometer with controlled temperature sweep J. Sci. Instrum., , [submitted for publication] Fernández van Raap, M.B., Socolovsky, L.M., Sánchez, F.H., Torriani, I., SAXS study of nanocrystalline FeyCu1-y alloys produced by ball milling (2002) J. Phys. Condens. Matter, 14, pp. 857-864 Monteiro, D.W.L., Larica, C., Nunes, E., Passamani, E.C., Alves, K.M.B., Magnetic and structural properties of the Cu/Fe alloys obtained by milling (1998) Hyperfine Interact. C, 3, pp. 17-20 Ma, E., Atzmon, M., Pinkerton, F.E., Thermodynamic and magnetic properties of metastable FexCu 100-x solid solutions formed by mechanical alloying (1993) J. Appl. Phys., 74, p. 955 Ambrose, T., Gavrin, A., Chien, C.L., Magnetic properties of metastable fcc Fe-Cu alloys prepared by high energy ball milling (1993) J. Magn. Magn. Mater., 124, p. 15