Study of the behaviour of CeO2 in SO2-containing environment

E. B. Várhegyi, J. Gerblinger, F. Réti, I. V. Perczel, H. Meixner

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The undoped n-type semiconductor CeO2 is a less studied but in many respects promising potential new sensor material. As in our former experiments (using different reactive gases) CeO2 proved to be a highly corrosion-resistant material, in this work detailed investigations have been carried out on its electrical and corrosion behaviour in a wide temperature range (300-800 °C) in oxygen- and SO2-containing atmospheres. Our most important results can be summarized as: (a) the resistance of CeO2 is practically uninfluenced either at 350 or 800 °C by SO2 if oxygen is present; (b) around these two temperatures no corrosive effect of SO2 can be observed either; (c) but at 550 °C in the presence of oxygen, the acceptor effect of SO2 can be observed; (d) at 550 °C during long-term heat treatment (100 h) in an SO2- and oxygen-containing atmosphere, the CeO2 in a thin surface layer transforms into CeO and the same time a reversible incorporation of a few percent of S into this layer can be observed. In the present work the connection between the sensitivity maximum for SO2 found at 550 °C in the presence of oxygen and a possible surface phase transformation is discussed.

Original languageEnglish
Pages (from-to)631-635
Number of pages5
JournalSensors and Actuators: B. Chemical
Volume25
Issue number1-3
DOIs
Publication statusPublished - Apr 1995

Keywords

  • Cerium dioxide
  • Sulfur dioxide sensors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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