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Effect of thermal treatment on the 4f-hopping conductivity of CeO2 exposed to CO(g) atmosphere by Alley Michael da Silva Procópio; Leandro Silva Rosa Rocha; Paula Mariela Desimone; Giuliana Giulietti; Celso Manuel Aldao; Elson Longo; Francisco Moura; Miguel Adolfo Ponce is a Materials Science article available to read on EtoBox.
What is Effect of thermal treatment on the 4f-hopping conductivity of CeO2 exposed to CO(g) atmosphere about?
The thermal treatment of CeO2 at 600 and 900 °C on the film response against CO is analyzed. A fluorite-type crystalline structure was observed, with the later presenting a well-defined morphology formed by the set of (100), (110) and (111) surfaces. The band-gap was 3.35 and 3.37 eV, for the 600 and 900 °C samples. We have proposed an equation based on the mass action law that shows the dependence of the carriers density as a function of the grain size, demonstrating that the area-volume relation can affect the number of charge carriers, which reflects in the pre-exponential A factor of conductivity. Reducing gases generate a greater number of carriers available for conduction, reflected on the A factor. When vacancies are annihilated by exposing to an oxygen atmosphere, the Ce (III) amount reduces. The activation energy and pre-factor A in air, vacuum and CO were calculated for correlating with the sample morphologies.
Who reads Effect of thermal treatment on the 4f-hopping conductivity of CeO2 exposed to CO(g) atmosphere?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Alley Michael da Silva Procópio; Leandro Silva Rosa Rocha; Paula Mariela Desimone; Giuliana Giulietti; Celso Manuel Aldao; Elson Longo; Francisco Moura; Miguel Adolfo Ponce
- Publisher
- Elsevier BV
- Published
- 2023
- Language
- EN
- Field
- Materials Science (Physical Sciences)