材料科学
热传导
大气(单位)
载流子
粒度
氧气
热导率
电导率
活化能
带隙
分析化学(期刊)
凝聚态物理
热力学
化学
物理
复合材料
物理化学
有机化学
光电子学
色谱法
作者
Alley Michael da Silva Procópio,L.S.R. Rocha,Paula Mariela Desimone,Giuliana Giulietti,C. M. Aldao,E. Longo,F. Moura,Miguel Adolfo Ponce
标识
DOI:10.1016/j.mseb.2023.116403
摘要
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 (1 0 0), (1 1 0) and (1 1 1) 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.
科研通智能强力驱动
Strongly Powered by AbleSci AI