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The coexistence of silicon borides with boron-saturated silicon: Metastability of SiB3

Published online by Cambridge University Press:  31 January 2011

T. L. Aselage
T. L. Aselage
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1421
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The silicon-rich end of the Si-B phase diagram, defining the silicon boride(s) that coexist in equilibrium with boron-saturated silicon, is poorly known. Understanding this equilibrium has implications for the processing of p+ silicon wafers, whose boron concentrations are near the solubility limit. Additionally, silicon boride precipitates produced by boron-ion-implantation and annealing of crystalline silicon have recently been shown to be efficient internal getters of transition metal ions. The experiments described in this paper probe the stability of these silicon borides. A phase with a boron-carbide-like structure, SiB3, grows from boron-saturated silicon in both the solid and the liquid state. However, SiB3 is not found to be stable in either circumstance. Rather, SiB3 is a metastable phase whose formation is driven by the relative ease of its nucleation and growth. The silicon boride that exists in stable equilibrium with boron-saturated silicon is SiB6. A qualitative understanding of the metastability of SiB3 comes from recognizing the conflict between the bonding requirements of icosahedral borides such as SiB3 and the size mismatch between silicon and boron atoms.

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Articles
Information
Journal of Materials Research , Volume 13 , Issue 7 , July 1998 , pp. 1786 - 1794
Copyright
Copyright © Materials Research Society 1998

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