Hostname: page-component-78c5997874-ndw9j Total loading time: 0 Render date: 2024-11-05T15:08:01.104Z Has data issue: false hasContentIssue false
  • English
  • Français

A Mössbauer spectroscopy study of nanoscale Ge–Sn dispersions prepared by ball milling

Published online by Cambridge University Press:  31 January 2011

P. Boolchand  and
C.C. Koch
P. Boolchand
Affiliation:
Department of Electrical and Computer Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0030
C.C. Koch
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695-7907
Get access

Abstract

Nanoscale mixtures of Ge/Sn, a nominally immiscible binary system, prepared by mechanical attrition have been studied by 119Sn Mössbauer spectroscopy. The Mössbauer measurements in general reveal two sites for the Sn atoms, a tetragonal β–Sn site and another site designated as “A”. The β-Sn integrated intensity decreases in magnitude with Ge concentration, 1 – x, in Ge1−xSnx as the second A-site intensity increases. The isomer shift and the small/negligible quadrupole splitting of site A suggests it represents Sn in solid solution in the Ge lattice. This in turn represents a large (12–24 at. %) nonequilibrium solid solubility of Sn in Ge prepared by mechanical milling, compared to the equilibrium value of <1.0 at. %. Oxidation of the Sn was detected by Mössbauer spectroscopy at Sn-poor concentrations (x ⋚ 0.10) when the milling vial was not totally free of oxygen (i.e., milling in impure argon). This may be due to rapid oxidation of finely divided Sn film particles possessing a large surface-to-volume ratio at these compositions.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 10 , October 1992 , pp. 2876 - 2883
Copyright
Copyright © Materials Research Society 1992

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Koch, C. C., “Mechanical Milling and Alloying,” Chapter 5 in Volume 15: Processing of Metals and Alloys, edited by Cahn, R. W., from Materials Science and Technology, a Comprehensive Treatment, edited by Cahn, R. W., Haasen, P., and Kramer, E. J. (VCH, Weinheim, Germany, 1991).Google Scholar
2Benjamin, J. S., Sci. Am. 234, 40 (1976).CrossRefGoogle Scholar
3Koch, C.C., Jang, J. S. C., and Gross, S.S., J. Mater. Res. 4, 557 (1989).CrossRefGoogle Scholar
4Jang, J.S.C. and Koch, C.C., J. Mater. Res. 5, 325 (1990).Google Scholar
5Turnbull, D., Jang, J.S.C., and Koch, C.C., J. Mater. Res. 5, 1731 (1990).CrossRefGoogle Scholar
6Greenwood, N. N. and Gibb, T. C., Mössbauer Spectroscopy (Chapman and Hall Ltd., London, 1971).CrossRefGoogle Scholar
7Weyer, G., Nylandsted-Larsen, A., Deutch, B.I., Andersen, J.V., and Antoncik, E., Hyp. Int. 1, 93 (1975).CrossRefGoogle Scholar
8Bolz, J. and Pobell, F., Z. Physik B20, 95 (1975).Google Scholar
9Kuzmin, R. N. and Nikitina, S. V., Sov. Phys. Solid State 13, 3151 (1972).Google Scholar
10Taniwaki, M., Uneta, M., Kasaya, K., and Maeda, M., J. Non Cryst. Solids 117-118 (pt. 1), 363 (1990).Google Scholar
11Olesinski, R.W. and Abbaschian, G.J., Bulletin of Alloy Phase Diagrams 5, 265 (1984).Google Scholar
12Ivanov, E., International Symposium on Mechanical Alloying (ISMA), May 7-10, 1991, Kyoto, Japan, Mater. Sci. Forum (Trans. Tech. Pub., Switzerland, 1992), Vol. 88-90, p. 475.Google Scholar
13Birringer, R., Hahn, H., Hofler, H., Karch, J., and Gleiter, H., Defect and Diffusion Forum 59, 17 (1988).Google Scholar