Cross-linking and average coordination in plasma-polymerized hydro- and fluorocarbons

doi:10.1016/0022-3093(86)90486-2

Journal of Non-Crystalline Solids

Volume 86, Issues 1–2, September 1986, Pages 179-189

https://doi.org/10.1016/0022-3093(86)90486-2 Get rights and content

Abstract

Some plasma-polymerized hydrocarbons and fluorocarbons, characterized by their highly cross-linked amorphous network, are shown to realize the glass-forming condition predicted by the constraint theory. In addition, probabilistic models of bond formation are proposed to compute the relative concentrations of CY_n(n = 0, 1, 3; Y = H or F) sites and the results are compared with the actual site distribution, known experimentally.

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We also demonstrate the existence of the critical inflection point at 〈r〉 ≤ 2.4 predicted by constraint theory. Some experimental evidence of a critical average coordination number has been previously reported for a variety chalcogenide glass compositions [39–41,48–53] and discussed in some investigations of a-Si:H [77,78] a-C:H [79–81], and a-CFx materials [82,83]. However in these studies, the focus has been primarily on bond/rigidity percolation and, to the author's knowledge, the presence of a critical point in pure group IV materials has yet to be clearly demonstrated experimentally.
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Cross-linking and average coordination in plasma-polymerized hydro- and fluorocarbons

Abstract

J. Non-Cryst Solids

Phys. Stat. Sol.

Phys. Today

Solid St. Commun.

Solid St. Commun.

J. Non-Cryst Solids

J. Appl. Phys.

Phys. Rev.

J. Appl. Phys.