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Effect of defect structure on gas sensitivity of LaCrO3

Published online by Cambridge University Press:  31 January 2011

Rong-Fong Huang  and
Wei-Yean Howng
Rong-Fong Huang
Affiliation:
Ceramic Technology Research Laboratory, Motorola Inc., Albuquerque, New Mexico 87113
Wei-Yean Howng
Affiliation:
Ceramic Technology Research Laboratory, Motorola Inc., Albuquerque, New Mexico 87113
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Abstract

The isopropyl alcohol gas sensitivity of LaCrO3 at 250 °C is found to depend on the amount of TiO2 content and cation stoichiometric ratio of the sample. The gas sensitivity enhancement is related to the defect structure and electrical conduction behavior of p-type, donor-doped semiconductive oxides. The high resistivity coupled with the increasing point defects by the donor dopants are responsible for the high gas sensitivity of TiO2 doped LaCrO3. It is believed that the positively charged ionic-type defects created by dopants act as trapping sites to adsorb oxygen.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 12 , December 1996 , pp. 3077 - 3082
Copyright
Copyright © Materials Research Society 1996

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References

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