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Journal of Applied Physics / Volume 85 / Issue 2 / CONDENSED MATTER: ELECTRICAL AND MAGNETIC PROPERTIES (PACS 71-76)

J. Appl. Phys. 85, 897 (1999); http://dx.doi.org/10.1063/1.369208 (6 pages)

Electrical and defect thermodynamic properties of nanocrystalline titanium dioxide

P. Knauth and H. L. Tuller

Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

(Received 29 May 1998; accepted 1 October 1998)

The electrical properties of dense nanocrystalline TiO2 ceramics with an average grain size of 35 nm were investigated by impedance spectroscopy and compared with a coarsened material with micron size grains. The nanocrystalline ceramics show an uncommon domain of ionic conductivity at high oxygen pressures and a steep increase of electronic conductivity at low oxygen pressures. These results are discussed in terms of defect chemical models. The enthalpy of reduction of the nanocrystalline TiO2 was deduced to be significantly lower than that of the coarsened material. This may be related to lower defect formation energies at interface sites. © 1999 American Institute of Physics.

© 1999 American Institute of Physics

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KEYWORDS and PACS

Keywords

titanium compounds, ceramics, nanostructured materials, mixed conductivity, electric impedance, heat of reaction, Frenkel defects, grain boundaries

PACS

  • 72.60.+g

    Mixed conductivity and conductivity transitions

  • 72.80.Ga

    Transition-metal compounds

  • 61.46.-w

    Structure of nanoscale materials

  • 61.72.Mm

    Grain and twin boundaries

  • 61.72.J-

    Point defects and defect clusters

  • 82.60.Cx

    Enthalpies of combustion, reaction, and formation

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.369208

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    Y.-M. Chiang, E. B. Lavik, I. Kosacki, H. L. Tuller, and J. Y. Ying, Appl. Phys. Lett. 69, 185 (1996)APPLAB000069000002000185000001.

    J. F. Baumard and E. Tani, J. Chem. Phys. 67, 857 (1977)JCPSA6000067000003000857000001.

    H. R. P. Frederikse, J. Appl. Phys. 32, 2211 (1961)JAPIAU000032000010002211000001.


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