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. 2019 Dec 25;10(1):54. doi: 10.3390/nano10010054

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Density of a-SiO $_{2}$ in the relaxation stage (circles). The dashed line denotes the average value (2.202 g/cm $^{3}$ ). (b) Radial distribution function (RDF) analysis for all pairs of a-SiO $_{2}$ model. The results of O-O and Si-Si pairs are shifted 10 and 20 up, respectively, for better view.