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| Titel | Aluminium oxide |
| Verlag | (Wikipedia) |
| Datum | 17. December 2010 |
| URL | https://en.wikipedia.org/w/index.php?title=Aluminium_oxide&oldid=406804634 |
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| Fußnoten | no |
| Fragmente | 1 |
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| [1.] Mrs/Fragment 042 01 - Diskussion Zuletzt bearbeitet: 2015-05-16 20:36:02 WiseWoman | Fragment, Gesichtet, Mrs, SMWFragment, Schutzlevel sysop, Seiten, die magische ISBN-Links verwenden, Verschleierung, Wikipedia Aluminium oxide 2010 |
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| Untersuchte Arbeit: Seite: 42, Zeilen: 1-7 |
Quelle: Wikipedia Aluminium oxide 2010 Seite(n): 1 (online source), Zeilen: - |
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| [The most common form of crystalline] alumina is known as corundum. The oxygen ions nearly form a hexagonal close-packed structure with aluminum ions filling two-thirds of the octahedral interstices. Each Al3+ center is octahedral. In terms of its crystallography, corundum adopts a trigonal Bravais lattice with a space group of R-3c (number 167 in the International Tables). The primitive cell contains two formula units of aluminium oxide. Alumina also exists in other phases, namely η-, χ-, γ-, δ-, and θ-aluminas. Each has a unique crystal structure and properties. The so-called β-alumina proved to be NaAl11O17. | The most common form of crystalline alumina is known as corundum. The oxygen ions nearly form a hexagonal close-packed structure with aluminium ions filling two-thirds of the octahedral interstices. Each Al3+ center is octahedral. In terms of its crystallography, corundum adopts a trigonal Bravais lattice with a space group of R-3c (number 167 in the International Tables). The primitive cell contains two formula units of aluminium oxide. Alumina also exists in other phases, namely γ-, δ-, η-, θ-, and χ-aluminas.[7] Each has a unique crystal structure and properties. The so-called β-alumina proved to be NaAl11O17.[8]
7. G. Paglia (2004). "Determination of the Structure of γ-Alumina using Empirical and First Principles Calculations Combined with Supporting Experiments" (free download). Curtin University of Technology, Perth. Retrieved 2009-05-05. 8. E. Wiberg and A. F. Holleman (2001). Inorganic Chemistry. Elsevier. ISBN 0-12-352651-5. |
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