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Impedance spectroscopy of grain boundaries in nanophase ZnO

Published online by Cambridge University Press:  03 March 2011

J. Lee ,
J.-H. Hwang ,
J.J. Mashek ,
T.O. Mason ,
A.E. Miller  and
R.W. Siegel
J. Lee
Affiliation:
Department of Chemical Engineering, University of Notre Dame, Notre Dame, Indiana 46556
J.-H. Hwang
Affiliation:
Department of Materials Science, Northwestern University, Evanston, Illinois 60208
J.J. Mashek
Affiliation:
Department of Materials Science, Northwestern University, Evanston, Illinois 60208
T.O. Mason
Affiliation:
Department of Materials Science, Northwestern University, Evanston, Illinois 60208
A.E. Miller
Affiliation:
Department of Chemical Engineering, University of Notre Dame, Notre Dame, Indiana 46556
R.W. Siegel
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

Sintered compacts of nanophase ZnO (∼60 nm average grain size, presintered at 600 °C) were made from powders (∼13 nm) prepared by the gas-condensation technique. Impedance spectra were taken as a function of temperature over the range 450–600 °C and as a function of oxygen partial pressure over the range 10−3−1 atm (550 and 600 °C only). The activation energy was determined to be 55 kJ/mole (0.57 eV) and was independent of oxygen partial pressure. The oxygen partial pressure exponent was −1/6. Impedance spectra exhibited nonlinear I-V behavior, with a threshold of approximately 6 V. These results indicate that grain boundaries are governing the electrical properties of the compact. Ramifications for oxygen sensing and for grain boundary defect characterization are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 9 , September 1995 , pp. 2295 - 2300
Copyright
Copyright © Materials Research Society 1995

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References

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