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Role of the Oriented Attachment Mechanism in the Phase Transformation of Oxide Nanocrystals

✍ Scribed by Caue Ribeiro; Cristiane Vila; José Milton Elias de Matos; Jefferson Bettini; Elson Longo; Edson R. Leite

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
486 KB
Volume
13
Category
Article
ISSN
0947-6539

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✦ Synopsis

Abstract

“Bottom‐up” methods to obtain nanocrystals usually result in metastable phases, even in processes carried out at room temperature or under soft annealing conditions. However, stable phases, often associated with anisotropic shapes, are obtained in only a few special cases. In this paper we report on the synthesis of two well‐studied oxides—titanium and zirconium oxide—in the nanometric range, by a novel route based on the decomposition of peroxide complexes of the two metals under hydrothermal soft conditions, obtaining metastable and stable phases in both cases through transformation. High‐resolution transmission electron microscopy analysis reveals the existence of typical defects relating to growth by the oriented attachment mechanism in the stable crystals. The results suggest that the mechanism is associated to the phase transformation of these structures.

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