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Change of ferric oxide (Fe2O3) semiconductor conductivity type in the interaction with reducing gases

✍ Scribed by A.A. Vasiliev; M.A. Polykarpov

Book ID
103960439
Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
366 KB
Volume
7
Category
Article
ISSN
0925-4005

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✦ Synopsis

Sensors and Actuators B, 7 ( 1992) 626-629 conductivity type in

The interaction processes between semiconductor ferric oxide (a-Fe,O,) obtained by different methods and reducing gases are investigated. It is shown that only cr-Fe,O, doped by 1 wt.% ZnO changes its conductivity type from p to n when adsorbing such gases. The long-term stability of a semiconductor gas sensor made of undoped cr-Fe,O, and cr-Fe,O, doped by SO,*-, Zn*+ and Sn4+ ions is studied. The most stable is the a-Fe,O, + 20% SnO, reducing gas sensor. Its conductivity changes less than 5% per month. These properties of a-Fe,O, are associated with the Mossbauer spectra of the materials under investigation. A new type of semiconductor gas-sensing device based on a gas-controlled p-n junction is suggested.

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