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Neutron Rietveld refinement of the structure of the ternary silicide Ti4Ni4Si7

Published online by Cambridge University Press:  31 January 2011

E. Horache ,
T. P. Feist ,
J. A. Stuart  and
J. E. Fischer
E. Horache
Affiliation:
Department of Materials Science and Engineering, LRSM, 3231 Walnut Street, University of Pennsylvania, Philadelphia, Pennsylvania 19104
T. P. Feist
Affiliation:
Department of Materials Science and Engineering, LRSM, 3231 Walnut Street, University of Pennsylvania, Philadelphia, Pennsylvania 19104
J. A. Stuart
Affiliation:
Department of Materials Science and Engineering, LRSM, 3231 Walnut Street, University of Pennsylvania, Philadelphia, Pennsylvania 19104
J. E. Fischer
Affiliation:
Department of Materials Science and Engineering, LRSM, 3231 Walnut Street, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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Abstract

The structure of Ti4Ni4Si7 is studied using powder neutron diffraction and Rietveld analysis. Prccise determination of the crystalline parameters, atomic positions, and temperature factors is achieved. A criterion previously elaborated for the phase TiFeSi2 is used to determine the coordination number. From the arrangement of the atoms in the unit cell and their interbond distances, we find that Si atoms are nearest neighbors to Ti and Ni. An extension of the same criterion shows that Ti–Ni and Ni–Si hybridization is likely to be strong while Ti–Ni hybridization is weak. A comparison with mono- and disilicides is made.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 9 , September 1990 , pp. 1887 - 1893
Copyright
Copyright © Materials Research Society 1990

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