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Mössbauer Parameters Describing Several Intermetallic Phases in Tin-Containing Solders*

Published online by Cambridge University Press:  15 February 2011

Robert C. Reno  and
Laszlo Takacs
Robert C. Reno
Affiliation:
Department of Physics, University of Maryland Baltimore County Baltimore MD 21228
Laszlo Takacs
Affiliation:
Department of Physics, University of Maryland Baltimore County Baltimore MD 21228
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Abstract

We report here on the Mbssbauer parameters of two intermetallic phases expected to be present in composite solders: the Cu9Sn3Ni phase present in some forms of eutectic Sn-Pb solders and the Ag-Sn (ζ) phase which may be present in lead-free solders containing appreciable amounts of silver. Both samples were prepared by mechanical alloying techniques.

Our results show that the isomer shift of the Ag-Sn ζ phase is + 2.13 mm/sec relative to SnO2 and the phase has a room-temperature recoilless fraction that is 36% of that of SnO2. The results for Cu9 Sn3Ni are an isomer shift of + 1.78 mm/sec and a recoilless fraction 58 % of that of SnO2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 323: Symposium J – Electronic Packaging Materials Science VII , 1993 , 201
Copyright
Copyright © Materials Research Society 1994

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Footnotes

*

This work is supported in part by the US Army, Harry Diamond Laboratories under a Cooperative Research and Development Agreement (CRADA) between UMBC and Army-HDL.

References

1. Reno, R. C., US Army Research Office Technical Report TCN–92–101Google Scholar
2. The ζ-Ag-Sn phase is a disordered hcp phase containing approximately 20 atomic percent tin. See Binary Alloy Phase Diagrams, Vol.1, ed. by Massalski, Thaddeus B. (ASM International, 1990), p. 94 Google Scholar
3. Harris, I. R. and Cordey-Hayes, M., J. Less Common Met. 16, 223 (1968)CrossRefGoogle Scholar
4. For a discussion of the effect of quadrupole interactions and isomer shifts on Mossbauer spectra, see standard reviews of Mössbauer spectroscopy such as Mossbauer Spectroscopy by Greenwood, N. N. and Gibb, T. C. (Chapman & Hall, London, 1971)Google Scholar
5. Reference 4, page 374.Google Scholar
6. Reference 1Google Scholar
7. A short discussion of recoilless fraction can be found in Reference 4, page 9. A more complete discussion is given in Mossbauer Spectroscopy, by Vertes, A., Korecz, L. and Burger, K. (Elsevier, Amsterdam, 1979)Google Scholar
8. Hohenemser, C., Phys. Rev. 139 A185 ( 1965)CrossRefGoogle Scholar
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