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Effects of Interstitial Additions on the Structure of Ti5Si3

Published online by Cambridge University Press:  31 January 2011

J. J. Williams ,
M. J. Kramer ,
M. Akinc  and
S. K. Malik
J. J. Williams
Affiliation:
Ames Laboratory and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011
M. J. Kramer
Affiliation:
Ames Laboratory and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011
M. Akinc
Affiliation:
Ames Laboratory and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011
S. K. Malik
Affiliation:
Tata Institute of Fundamental Research, Bombay 400005, India, and University of Missouri Research Reactor, Columbia, Missouri 65211
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Abstract

Changes in the structure of Ti5Si3 were measured by x-ray and neutron diffraction as carbon, nitrogen, or oxygen atoms were systematically incorporated into the lattice. Additionally, the lattice parameters and variable atomic positions of pure Ti5Si3 were determined to be a = 7.460 Å, c = 5.152 Å, xTi = 0.2509, and xSi = 0.6072. The measured trends in lattice parameters as carbon, nitrogen, or oxygen atoms were added to Ti5Si3 showed that most of the previous studies on supposedly pure Ti5Si3 were actually contaminated by these pervasive light elements. Also, oxygen and carbon additions were shown to strongly draw in the surrounding titanium atoms—evidence for bonding between these atoms. The bonding changes that occurred on addition of carbon, nitrogen, or oxygen acted to decrease the measured anisotropic properties of Ti5Si3, such as thermal expansion.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 8 , August 2000 , pp. 1773 - 1779
Copyright
Copyright © Materials Research Society 2000

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References

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