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Oxygen diffusivity in MoO3 as determined by a temperature programmed method

Published online by Cambridge University Press:  31 January 2011

Todd P. St. Clair ,
Jill M. Restad  and
S. Ted Oyama
Todd P. St. Clair
Affiliation:
Department of Chemical Engineering, Environmental Catalysis and Materials Laboratory, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0211
Jill M. Restad
Affiliation:
Department of Chemical Engineering, Environmental Catalysis and Materials Laboratory, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0211
S. Ted Oyama*
Affiliation:
Department of Chemical Engineering, Environmental Catalysis and Materials Laboratory, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0211
*
a) Author to whom correspondence should be addressed.
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Abstract

A temperature programmed method for determining diffusivities has been previously applied to oxygen diffusivity in V2O5. In this communication we extend the method to the case of oxygen diffusivity in MoO3. The reduction of MoO3 to MoO2 using NH3 is utilized to obtain experimental parameters such as the temperature of reduction and the activation energy for oxygen diffusion. These parameters are in turn used to solve Fick's equation for the oxygen diffusivity D0. The utility of this temperature programmed method for obtaining diffusivities has now been clearly established by extension to MoO3.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 6 , June 1998 , pp. 1430 - 1433
Copyright
Copyright © Materials Research Society 1998

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References

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