Point Defects in Nb22O54 Oxidized at 200°C
- 1 February 1982
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 21 (2A) , L97-99
- https://doi.org/10.1143/jjap.21.l97
Abstract
The structural changes in a Nb22O54 crystal heated at 200°C in air were examined using 1 MV high-resolution transmission electron microscopy. At the initial stage of oxidation, NbO6 octahedra are locally shifted by one atomic distance. This movement induces two types of point defect, which array in a string of limited length. Both require additional oxygen atoms at the interstitial sites and, therefore, can act as a possible mechanism for oxidation. At the advanced stage of oxidation, a superstructure is formed.Keywords
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