Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 15, Pages 7828-7834Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.08.022
Keywords
Sintering; Dopant; Ytterbium oxide; Densification kinetics; Activation energy
Categories
Funding
- US Department of Energy, National Energy Technol-ogy Lab
- GE Gas Power
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The effect of temperature and heating rate on the densification of ytterbia, with and without titania doping, was investigated in this study. It was found that titania doping enhances the densification behavior of ytterbia up to a certain level, and improves the crystal structure. The increased densification rate is attributed to the formation of cation vacancy and lattice distortion, while titania doping increases the activation energy for densification.
The effect of temperature and heating rate on the densification of ytterbia (Yb2O3), with and without titania (TiO2) doping was investigated. It is shown that up to a certain doping level, titania doping enhances the densification behaviour of ytterbia. The effect of titania doping on crystal structure confirms that titania is substitutionally incorporated in ytterbia up to the solubility limit, which corresponds well with the densification results. The increased densification rate of titania-doped ytterbia is attributed to the formation of cation vacancy and lattice distortion. Using constant heating rate experiments, the activation energy for densification has been calculated and it is shown that in the intermediate density range (60 % to 85 %), the activation energy is independent of the density. Titania doping increases the activation energy for densification.
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