Surface segregation effect in nanocrystalline Mg-Ni alloys and composites

• Autorzy: Smardz K. , Smardz L. , Okońska I. , Jurczyk M.
• Konferencja: Conference New Materials for Magnetoelectronics, Będlewo, 3-6 May 2006
• Języki publikacji: EN

Abstrakty

EN

X-ray photoelectron spectroscopy studies showed that the surface segregation of Mg atoms and width of the valence band in the nanocrystalline Mg2Ni alloy are greater compared to those observed in polycrystalline Mg2Ni thin films. Especially, a strong surface segregation of Mg atoms was observed for the Mg2Ni/Pd composites. In this case, Mg atoms strongly segregate to the surface and form an Mg-based oxide layer under atmospheric conditions. The lower lying Ni and Pd atoms form a metallic subsurface layer and could be responsible for the observed, relatively high hydrogenation rate. Furthermore, the valence band broadening observed in the nanocrystalline Mg2Ni alloys and Mg2Ni/Pd composites could also significantly influence their hydrogenation properties.

Słowa kluczowe

EN

Ni-Mg alloy; nanocrystalline alloy; electronic structure

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2007
• Tom: Vol. 25, No. 2
• Strony: 423--428
• Opis fizyczny: Bibliogr. 14 poz.

Twórcy

autor

Smardz K.

autor

Smardz L.

autor

Okońska I.

autor

Jurczyk M.

• Institute of Materials Science and Engineering, Poznań University of Technology, M. Skłodowskiej-Curie 5, 60-965 Poznań, Poland

Bibliografia

• [1] ZALUSKI L., ZALUSKA A., STRÖM-OLSEN J.O., J. Alloys Comp., 217 (1995), 245.
• [2] LEI Y.Q., WU Y.M., YANG Q.M., WU J., WANG Q.D., Z. Phys. Chem., 183 (1994), 379.
• [3] SIEGMANN H.C., SCHLAPBACH L., BRUNDLE C.R., Phys. Rev. Lett., 40 (1978), 972.
• [4] SCHLAPBACH L., Hydrogen in Intermetallic Compounds, II, Springer, Berlin, 1992, p. 165.
• [5] SCHLAPBACH L., SEILER A., STUCKI F., SIEGMANN H.C., J. Less Common Met., 73 (1980), 145.
• [6] ORIMO S., FUJII H., Intermetallics, 6 (1998), 185.
• [7] GUPTA M., BERLIN E., SCHALPBACH L., J. Less Common Met., 103 (1984), 389.
• [8] MU D., HATANO Y., ABE T., WATANABE K., J. Alloys Comp., 334 (2002), 232.
• [9] SMARDZ K., SZAJEK A., SMARDZ L., JURCZYK M., Mol. Phys. Rep., 40 (2004), 131.
• [10] FITZSIMMONS M.R., ESTMAN J.A., ROBINSON R.A., LAWSON A.C., THOMPSON J.D., MORSHOVICH R., Phys. Rev., B48 (1993), 8245.
• [11] SMARDZ K., SMARDZ L., JURCZYK M., JANKOWSKA E., phys. stat. sol. a, 196 (2003), 263.
• [12] SMARDZ L., SMARDZ K., NOWAK M., JURCZYK M., Crys. Res. Technol., 36 (2001), 1385.
• [13] BOUTEN P.C., MIEDEMA A.R., J. Less Common Met., 71 (1980), 147.
• [14] GRIESSEN R., PHYS. Rev., B38 (1988) , 3690.