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Shock synthesis of nanocrystalline Si by thermal spraying

Published online by Cambridge University Press:  31 January 2011

R. Goswami ,
S. Sampath ,
H. Herman  and
J. B. Parise
R. Goswami
Affiliation:
Center for Thermal Spray Research, Department of Materials Science, State University of New York at Stony Brook, Stony Brook, NY 11794–2274
S. Sampath
Affiliation:
Center for Thermal Spray Research, Department of Materials Science, State University of New York at Stony Brook, Stony Brook, NY 11794–2274
H. Herman
Affiliation:
Center for Thermal Spray Research, Department of Materials Science, State University of New York at Stony Brook, Stony Brook, NY 11794–2274
J. B. Parise
Affiliation:
Department of Geosciences and Center for High Pressure Research, State University of New York at Stony Brook, Stony Brook, NY 11794–2100
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Abstract

Shock synthesis of nanocrystalline Si was accomplished for the first time using thermal spray in which Si powder is injected into a high-energy flame where the particles melt and accelerate to impact on the substrate. A stream of molten Si particles impacted onto Si wafers of two orientations (100) and (111). The shock wave generated by the sudden impact of the droplets propagated through the underlying Si layer, which experienced a phase transition to a high-pressure form of Si due to propagation of the shock wave. The metastable high-pressure form of Si then transformed to metastable Si-IX, Si-IV (hexagonal diamond-Si), R-8, and BC-8 phases as evidenced by transmission electron microscopy and x-ray diffraction studies. Back-transformed metastable Si grains, with a size range from 2 to 5 nm, were found to be dispersed within Si-I (cubic diamond-Si). The metastable phases formed mostly in deposits on the (100) substrate compared to those of the (111) substrate orientations. This behavior can be correlated with the anisotropic nature of the pressure-induced transformations of Si-I.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 14 , Issue 9 , September 1999 , pp. 3489 - 3492
Copyright
Copyright © Materials Research Society 1999

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