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Proceedings Paper

EPR studies of some ferrates and their correlation with humidity sensitivity
Author(s): Puneet Misra; Rajesh Kumar Shukla; L. M. Bali; C. L. Gupta; G. C. Dubey
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Paper Abstract

Various oxides have been reported to be sensitive to humidity of the environment. Recently ceramic type humidity sensors using aluminates and ferrates are widely reported as stable sensors. The change in electrical resistance due to change in humidity is considered due to adsorption of water molecule in the pores of material. If the material has more active centers, it will yield better results. It is suggested that the protonic conduction is possible due to pores where H3O+ and OH- ions are formed due to moisture adsorption. The formations of protonic ions are possible if electrically active centers are present which will help to increase the sensitivity. It αis expected that in porous structure/surface the presence of dangling bonds may act as electrically active centers and facilitate the increase in sensitivity of the humidity sensor. The present paper reports the measurement of spin density of ferrates fired at different temperatures and correlates its humidity sensitivity with spin density. This explains that dangling bonds act as active centers and if the process of fabrication of humidity sensor increases the dangling bonds, it is possible to increase the sensitivity of the sensor.

Paper Details

Date Published: 14 October 2003
PDF: 8 pages
Proc. SPIE 5062, Smart Materials, Structures, and Systems, (14 October 2003); doi: 10.1117/12.514849
Show Author Affiliations
Puneet Misra, Lucknow Univ. (India)
Rajesh Kumar Shukla, Lucknow Univ. (India)
L. M. Bali, Lucknow Univ. (India)
C. L. Gupta, Solid State Physics Lab. (India)
G. C. Dubey, Solid State Physics Lab. (India)

Published in SPIE Proceedings Vol. 5062:
Smart Materials, Structures, and Systems
S. Mohan; B. Dattaguru; S. Gopalakrishnan, Editor(s)

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