Nanocrystalline Transition Aluminas: Nanostructure and Features of X-Ray Powder Diffraction Patterns of Low-Temperature Al2O3 Polymorphs Full article
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Physical Review B, Condensed Matter and Materials Physics (up to 2016)
ISSN: 1098-0121 , E-ISSN: 1550-235X |
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| Output data | Year: 2008, Volume: 77, Number: 2, Pages: 024112-1-024112-13 Pages count : 13 DOI: 10.1103/PhysRevB.77.024112 | ||||
| Tags | PHASE-TRANSFORMATIONS; REAL STRUCTURE; GAMMA-Al2O3; SPINEL; GAMMA | ||||
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Abstract:
Low-temperature γ-, η-, and χ-Al2O3 polymorphs were studied by high resolution transmission electron microscopy and x-ray powder diffraction along with computer simulation of the diffraction patterns. Planar defects lying on the {111}, {110}, and {100} planes, which are the origin of the broadening of x-ray diffraction peaks in different forms of aluminium oxide, were revealed. In addition to providing strong experimental support for the imperfect character of the specimen structures, these results demonstrate the possibility of using nanosized crystalline domains with a spinel-type arrangement, which are regularly shaped and have a specified, developed face and bounding surfaces, for the description of the nanostructure of a whole variety of lowtemperature Al2O3 derivatives. It was found that different ways of domain packing in the oxide particles with a subsequent formation of planar defects contribute to specific kinds of line-shape broadening observed in the x-ray diffraction patterns of these materials. The mechanism of the vacancy generation upon propagation of the shear-type defect in the {110} plane of the spinel structure, which changes the Al3O4 stoichiometry to Al2O3, is also discussed.
Cite:
Tsybulya S.V.
, Kryukova G.N.
Nanocrystalline Transition Aluminas: Nanostructure and Features of X-Ray Powder Diffraction Patterns of Low-Temperature Al2O3 Polymorphs
Physical Review B, Condensed Matter and Materials Physics (up to 2016). 2008. V.77. N2. P.024112-1-024112-13. DOI: 10.1103/PhysRevB.77.024112 WOS Scopus РИНЦ ANCAN OpenAlex
Nanocrystalline Transition Aluminas: Nanostructure and Features of X-Ray Powder Diffraction Patterns of Low-Temperature Al2O3 Polymorphs
Physical Review B, Condensed Matter and Materials Physics (up to 2016). 2008. V.77. N2. P.024112-1-024112-13. DOI: 10.1103/PhysRevB.77.024112 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | May 3, 2007 |
| Accepted: | Oct 18, 2007 |
| Published print: | Jan 1, 2008 |
| Published online: | Jan 28, 2008 |
Identifiers:
| Web of science: | WOS:000252862600027 |
| Scopus: | 2-s2.0-38849172433 |
| Elibrary: | 13576805 |
| Chemical Abstracts: | 2008:179253 |
| Chemical Abstracts (print): | 148:414720 |
| OpenAlex: | W2068441380 |