Rapidly Solidified Melt-spun Bi-Sn Ribbons: Surface Composition Issues

  • Tarek El Ashram Physics Department, Faculty of Science , Port Said University, Port Said, Egypt
  • Ana P. Carapeto Centro de Química-Física Molecular and Institute of Nanoscience and Nanotechnology, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.
  • Ana M. Botelho do Rego Centro de Química-Física Molecular and Institute of Nanoscience and Nanotechnology, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.

Abstract

Tin-bismuth alloy ribbons were produced using melt-spinning technique. The two main surfaces (in contact with the rotating wheel and exposed to the air) were characterized with Optical Microscopy and AFM, revealing that the surface exposed to the air is duller (due to a long-range heterogeneity) than the opposite surface. Also the XPS chemical composition revealed many differences between them both on the corrosion extension and on the total relative amounts of tin and bismuth. For instance, for the specific case of an alloy with a composition Bi-4 wt % Sn, the XPS atomic ratios Sn/Bi are 1.1 and 3.7 for the surface in contact with the rotating wheel and for the one exposed to air, respectively, showing, additionally, that a large segregation of tin at the surface exists (nominal ratio should be 0.073). This segregation was interpreted as the result of the electrochemical process yielding the corrosion products.

Author Biography

Tarek El Ashram, Physics Department, Faculty of Science , Port Said University, Port Said, Egypt

Physics Department

Assocaite Professor

Published
2015-05-30
How to Cite
EL ASHRAM, Tarek; CARAPETO, Ana P.; BOTELHO DO REGO, Ana M.. Rapidly Solidified Melt-spun Bi-Sn Ribbons: Surface Composition Issues. JOURNAL OF ADVANCES IN PHYSICS, [S.l.], v. 11, n. 5, p. 3287-3297, may 2015. ISSN 2347-3487. Available at: <https://cirworld.com/index.php/jap/article/view/369>. Date accessed: 23 nov. 2017.
Section
Articles

Keywords

oxides; intermetallic compounds; atomic force microscopy; photoelectron spectroscopy; surfaces