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Role of bonding and coordination in the atomic structure and energy of diamond and silicon grain boundaries

Published online by Cambridge University Press:  31 January 2011

P. Keblinski ,
D. Wolf ,
S. R. Phillpot  and
H. Gleiter
P. Keblinski
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, and Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany
D. Wolf
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
S. R. Phillpot
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
H. Gleiter
Affiliation:
Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany
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Abstract

The high-temperature equilibrated atomic structures and energies of large-unit-cell grain boundaries (GB's) in diamond and silicon are determined by means of Monte-Carlo simulations using Tersoff's potentials for the two materials. Silicon provides a relatively simple basis for understanding GB structural disorder in a purely sp3 bonded material against which the greater bond stiffness in diamond combined with its ability to change hybridization in a defected environment from sp3 to sp2 can be elucidated. We find that due to the purely sp3-type bonding in Si, even in highly disordered, high-energy GB's at least 80% of the atoms are fourfold coordinated in a rather dense confined amorphous structure. By contrast, in diamond even relatively small bond distortions exact a considerable price in energy that favors a change to sp2-type local bonding; these competing effects translate into considerably more ordered diamond GB's; however, at the price of as many as 80% of the atoms being only threefold coordinated. Structural disorder in the Si GB's is therefore partially replaced by coordination disorder in the diamond GB's. In spite of these large fractions of three-coordinated GB carbon atoms, however, the three-coordinated atoms are rather poorly connected amongst themselves, thus likely preventing any type of graphite-like electrical conduction through the GB's.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 8 , August 1998 , pp. 2077 - 2100
Copyright
Copyright © Materials Research Society 1998

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