Elastic Properties of Dense Organosilicate Glasses Dependent on the C/Si Ratio

Abstract:

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Organosilicate glasses (OSG) are of great technological interest as low-k dielectrics. We use ab initio simulations to analyze the influence of the C/Si ratio in OSG on the density and elastic properties of pore-free material to gain a detailed understanding of the origins of these properties in this class of materials. We find that the addition of carbon to amorphous silica leads to a stiffening of the material by removing the bending degrees of freedom of Si-O-Si bonds. This transition in mechanisms of stiffness, leads to a distinctly nonlinear behavior of the bulk and elastic modulus over the C/Si ratio. Experimental results do not contradict our findings, however dominant pore effects impede conclusive comparison.

Info:

Periodical:

Materials Science Forum (Volumes 645-648)

Edited by:

Anton J. Bauer, Peter Friedrichs, Michael Krieger, Gerhard Pensl, Roland Rupp and Thomas Seyller

Pages:

267-270

DOI:

10.4028/www.scientific.net/MSF.645-648.267

Citation:

J. M. Knaup et al., "Elastic Properties of Dense Organosilicate Glasses Dependent on the C/Si Ratio", Materials Science Forum, Vols. 645-648, pp. 267-270, 2010

Online since:

April 2010

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Price:

$35.00

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