Concentration Dependence Of Hyperfine Parameters Of Fe-cu Alloys

Fe-Cu alloys produced by mechanical alloying were studied by Mössbauer spectroscopy. Room-temperature Mössbauer spectroscopy done on samples of Fex-Cu100-x (10< x< 45) show a change with concentration, from a superparamagnetic doublet to a broad sextet. The isomer shift behavior with concentration is analyzed with a simple model based on the chemical neighborhood. Quadrupole splitting slightly increases with concentration. Hyperfine parameters of high-temperature spectra of concentrated samples follow the behavior observed for the less-concentrated samples. A comparison with the hyperfine parameters of Fe-Cu alloys obtained by sputtering is done.2297101Uenishi, K., Kobayashi, K., Nasu, S., Hatano, H., Ishihara, K., Shingu, P.H., (1992) Z. Metallkd., 83, p. 132Yavari, A.R., Desré, P.J., Benameur, T., (1992) Phys. Rev. Lett., 68, p. 2235Ma, E., Atzmon, M., Pinkerton, F.E., (1993) J. Appl. Phys., 74 (2), p. 955Eilon, M., Ding, J., Street, R., (1995) J. Phys.: Condens. Matter, 7, p. 4921Saxena, S.S., Tang, J., Lee, Y., O'Connor, C.J., (1994) J. Appl. Phys., 76 (10), p. 6820Ding, J., Eilon, M., Street, R., St Pierre, T., Smith, P., McCormick, P.G., (1995) J. Magn. Magn. Mat., 140-144, p. 471Barro, M.J., Navarro, E., Agudo, P., Hernando, A., Crespo, P., García Escorial, A., (1997) Mat. Sci. Forum, 235-238, p. 553Socolovsky, L.M., Sánchez, F.H., Yasuna, K., Otsuki, A., Ishihara, K., Shingu, P.H., (1998) Hyp. Int. (C), 3, p. 210Jiang, J.Z., Gonser, U., Gente, C., Bormann, R., (1993) Appl. Phys. Lett., 63 (20), p. 2768Socolovsky, L.M., Sánchez, F.H., Shingu, P.H., (2001) Hyp. Int., 133, p. 47Shenoy, G., Wagner, F., (1978) Mössbauer Isomer Shifts, p. 409. , North Holland, AmsterdamChien, C.L., Liou, S.H., Kofalt, D., Wu, Y., Egami, T., McGuire, T.R., (1986) Phys. Rev. B, 33, p. 3247L. M. Socolovsky, F. H. Sánchez, unpublished resultsMonteiro, D.W.L., Larica, C., Nunes, E., Passamani, E.C., Alves, K.M.B., (1998) Hyperfine Interactions (C), 3, p. 17Elkalkouli, R., Chartier, P., Dinhut, J.F., (1995) Mat. Sci. Forum, 179-181, p. 267Macrí, P.P., Rose, P., Frattini, R., Enzo, S., Principi, G., Hu, W.X., Cowlam, N., (1994) J. Appl. Phys., 76 (7), p. 4061Agüero, O.E., Socolovsky, L.M., Torriani, I.L., Crystallite size and strain study of a nanostructured Fe-Cu alloy from diffraction profile analysis (2003) ISMANAM Conference, , presentation to the, Foz do Iguaçu, BrazilMcLean, A.B., Mitchell, C.E.J., Swanston, D.M., (1994) Journal of Electron Spectroscopy, 69, pp. 125-132Socolovsky, L.M., Sánchez, F.H., (2003) Materials Characterization, 50, pp. 123-12