1. [Untitled]
- Author
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Ernő Kuzmann, M. El-Sharif, C. U. Chisholm, A. Vértes, and I. W. Brooke
- Subjects
Materials science ,Health, Toxicology and Mutagenesis ,Alloy ,Public Health, Environmental and Occupational Health ,Analytical chemistry ,chemistry.chemical_element ,engineering.material ,Microstructure ,Pollution ,Copper ,Analytical Chemistry ,Amorphous solid ,Crystallography ,Chromium ,Nuclear Energy and Engineering ,chemistry ,Conversion electron mössbauer spectroscopy ,Mössbauer spectroscopy ,engineering ,Radiology, Nuclear Medicine and imaging ,Tin ,Spectroscopy - Abstract
119Sn conversion electron Mossbauer spectroscopy, X-ray diffractometry and energy dispersive X-ray analysis (EDAX) were employed to investigate microstructure, composition and phases present in as-electroplated Sn-Cr and Sn-Cr-Zn alloys deposited on copper substrates. In the Sn-Cr deposits Cu, β-Sn, Cr-Sn phases can be identified by X-ray diffractometry. The phase composition is significantly different between the samples prepared with relatively higher and lower current densities. In the diffractograms of Sn-Cr-Zn deposits Cu, β-Sn, Zn phases can be well identified. A small intensity amorphous peak is also present, which can perhaps be associated with the presence of some amorphous Zn and Sn alloy. 119Sn Mossbauer spectra of Sn-Cr deposits exhibit an asymmetric broad main line centered near the isomer shift characteristic of β-Sn as well as they contain a small component near the zero velocity which can be attributed to a SnO2 phase based upon its characteristic. 119Sn Mossbauer spectra of Sn-Cr-Zn deposits are roughly similar to those of Sn-Cr deposits although the Mossbauer parameters of the third phase are different and vary with the Zn content. The presence of SnO2 on the surface mainly in the Sn-Cr samples can be attributed to the corrosion process in the air.
- Published
- 2000
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