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- W2016038340 abstract "The prevailing dualistic concepts of continuous random network structure (CRNS) and assemblies of microcrystals or clusters in silica glass are solved by applying the theory of paracrystallinity and the analysis of the radial distribution functions of X-ray diffraction diagrams. SiO2-glass. as well as the two cristobalite modifications (tetragonal α-cristobalite, D(P4121); cubic β-cristobalite, Fd3m) are built up of microparacrystals (mPC) with different sizes and levels of distortion. The paracrystalline lattice distortion parameter of silica glass is high (g ≈︁ 12%) while in the two cristobalite types it is much lower (g = 1.3%). The mean number of netplane layers N in the mPCs of silica glass is 3. whereas in α- and β-cristobalite it is much larger; 32 and 45 layers, respectively. A schematic model is given for the topological structure of silica glass, α- and β-cristobalite from which follows, that the structure of silica glass cannot be obtained simply by applying the same paracrystalline distortion g = 12% on either β- or α-cristobalite, but it requires a separate topological model. Die vorherrschenden dualistischen Konzepte über die kontinuierliche “random” Netzwerkstruktur (CRNS) und mikrokristallinen Anordnungen bzw. Cluster im Kieselglas wird durch die Anwendung der Theorie der Parakristallinität und durch die Analyse der radialen Verteilungsfunktionen von Röntgen-beugungsdiagrammen gelöst. Sowohl SiO2-Glas als auch die beiden Cristobalit-Modifikationen (α-Cristobalit. tetragonal D(P4121); β-Cristobalit, kubisch Fd3m) sind aus Mikroparakristallen (mPC) mit unterschiedlichen Größen und Verzerrungsgraden aufgebaut. Im SiOi-Glas ist der parakristalline Gitterverzerrungsparameter groß (g ≈︁ 12%), während er in den beiden Cristobalit-Modifikationen wesentlich kleiner ist (g = 1,3%). Die mittlere Anzahl der Netzebenenlagen N in den mPCs des Kieselglases ist 3, dagegen ist diese Anzahl der Gitterlagen im α- und β-Cristobalit wesentlich größer, nämlich 32 bzw. 45. Es wird ein schematisches Modell ür die topologische Struktur des Kieselglases, des α- und des β-Cristobalits gegeben, aus dem folgt, daß die Struktur des Kieselglases nicht einfach durch Anwendung der gleichen parakristallinen Verzerrung g = 12% auf β- oder α-Cristobalit erhalten werden kann, sondern es ist ein anderes separates topologisches Modell erforderlich." @default.
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- W2016038340 date "1991-08-16" @default.
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- W2016038340 title "Paracrystalline Lattice Structure of Silica Glass, α- and β-Crystobalite" @default.
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- W2016038340 doi "https://doi.org/10.1002/pssa.2211260203" @default.
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