The Effect of Oxygen on the Brittle-to-Ductile Transition in Silicon Single Crystals

Abstract:

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The brittle-to-ductile transition (BDT) in Czochralski (CZ) grown silicon single crystals and floating-zone (FZ) grown silicon single crystals was investigated by three-point bending. The temperature dependence of the apparent fracture toughness was measured in three different cross-head speeds. It was found that the BDT temperature in the CZ silicon crystal was higher than that in FZ silicon crystal, suggesting that the solute oxygen decreases dislocation mobility. However, the activation energies obtained from the strain rate dependence of the BDT temperatures were nearly the same in both the CZ and FZ silicon crystals, indicating that the dislocation mobility is not influenced by the solute oxygen. In this paper, the origin of the difference in the BDT temperature is discussed, focusing the role of the solute oxygen on the dislocation glide.

Info:

Periodical:

Materials Science Forum (Volumes 654-656)

Main Theme:

Edited by:

Jian-Feng Nie and Allan Morton

Pages:

1299-1302

DOI:

10.4028/www.scientific.net/MSF.654-656.1299

Citation:

Y. J. Hong et al., "The Effect of Oxygen on the Brittle-to-Ductile Transition in Silicon Single Crystals", Materials Science Forum, Vols. 654-656, pp. 1299-1302, 2010

Online since:

June 2010

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$35.00

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