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Energetics of C11b, C40, C54, and C49 structures in transition-metal disilicides

Published online by Cambridge University Press:  31 January 2011

A.E. Carlsson  and
P.J. Meschter
A.E. Carlsson
Affiliation:
Department of Physics, Washington University, St. Louis, Missouri 63130
P.J. Meschter
Affiliation:
McDonnell Douglas Research Laboratories, 224/111–1041, P. O. Box 516, St. Louis, Missouri 63166
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Abstract

The relative energies of the related C11b, C40, and C54 crystal structures of group IV–VII transition-metal disilicides are obtained by ab initio self-consistent band-structure calculations using the augmented-spherical-wave (ASW) method. The structural energy differences among these three structures correlate strongly with d-band filling, with C40 being stabilized relative to C54 and C11b relative to C40 as the transition-metal d-electron count increases. The C40/C11b energy difference is <0.05 eV/atom only for CrSi2 and MoSi2. Relative C11b/C40/C54 energies are similar in magnitude to those obtained in previous studies of L12/D022/D023 competition in transition-metal aluminides.1,2 Calculations of the C49/C54 energetic competition are inaccurate; the differences in atomic coordination in these two structures are probably too large for the computational method to handle accurately. The total-energy results are interpreted by a detailed analysis of the electronic density-of-states (DOS) distributions. The stable structures do not correlate as strongly with DOS effects in the vicinity of the Fermi level as in the aluminides.

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Journal of Materials Research , Volume 6 , Issue 7 , July 1991 , pp. 1512 - 1517
Copyright
Copyright © Materials Research Society 1991

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References

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