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Electron Microscopy Study of Stoichiometric and Non-Stoichiometric Titania

Published online by Cambridge University Press:  02 July 2020

Solórzano I.G. ,
Kotani T. ,
Tuller H.L.  and
Van der Sande J.B.
Solórzano I.G.
Affiliation:
Departamento de Ciência dos Materials e Metalurgia, PUC-Rio, C.P., 38008, Gávea, 22453-900, Rio de Janeiro, Brazil.
Kotani T.
Affiliation:
Center for Materials Science and Engineering, MIT, Cambridge, MA, 02139, USA.
Tuller H.L.
Affiliation:
Center for Materials Science and Engineering, MIT, Cambridge, MA, 02139, USA.
Van der Sande J.B.
Affiliation:
Center for Materials Science and Engineering, MIT, Cambridge, MA, 02139, USA.
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Extract

It is currently well recognized that oxides are able to accommodate deviations from stoichiometry (1) and great advances in this understanding have been achieved by using transmission electron microscopy (TEM), particularly through lattice imaging and electron diffraction techniques (2). The physical properties of non-stoichiometric oxides are strongly influenced by their exact composition and for this reason they represent a class of materials with increasing and novel properties that are put to use in, for example, oxygen sensors and high-Tc superconductors. On the other hand, in electroceramic materials, such as TiO2, grain boundary structure and chemistry are important to be characterized in detail since these variables are responsible for the electric activity.

Rutile (TiO2) can accommodate relatively large deviations from stoichiometry (TiOx with 2.0≥x≤ 1.75) by the crystallographic shear (CS) mechanism (1). The formation of CS planes is effectively a two-step process which involves the ordering of oxygen vacancies on a crystallographic plane and on their elimination by a shear of the lattice.

Type
Atomic Structure and Mechanisms at Interfaces in Materials
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 669 - 670
Copyright
Copyright © Microscopy Society of America 1997

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References

reference

1.Wodsley, A. B., (1967), Helv. Chem. Acta, Werner Centenary, Vol. 208.Google Scholar
2.Sorensen, O.T., (1981), “Non Stoichiometric Oxides”, Academic Press, New York.Google Scholar
3.Haggerty, J. S. and Wills, K.K, (1991), Ceramic Eng. Sci.Proc, 12, 1785.10.1002/9780470313848.ch13CrossRefGoogle Scholar