We report the effect of the charge compensation on the electronic transport and optical properties of CeO2 co-doped with donor, Nb, and acceptor, Y, ions. As expected, the concentration of Ce3+ decreases with an increase in the Y content in Ce0.992−xNb0.008YxO2, where 0 ≤ x ≤ 0.008. More importantly, random electric fields generated by the Y ions bring additional disorder into the system. As a result, the high-temperature activation energy of conductivity increases significantly from 189 to 430 meV. A similar energy shift in the optical absorption peak centered at 1.3–1.5 eV is attributed to an increase in the energy gap separating the localized f-electrons from the empty Ce 4f band. The results underline the paramount importance of the disorder-induced Anderson localization of the f-electrons in ceria.
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28 April 2018
Research Article|
April 26 2018
Disorder-induced f-electron localization in Nb and Y co-doped CeO2
T. Charoonsuk;
T. Charoonsuk
1
Electroceramic Research Laboratory, College of Nanotechnology, King Mongkut's Institute of Technology Ladkrabang
, Bangkok 10520, Thailand
2
Advanced Material Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang
, Bangkok 10520, Thailand
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N. Vittayakorn;
N. Vittayakorn
1
Electroceramic Research Laboratory, College of Nanotechnology, King Mongkut's Institute of Technology Ladkrabang
, Bangkok 10520, Thailand
2
Advanced Material Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang
, Bangkok 10520, Thailand
3
Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang
, Bangkok 10520, Thailand
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T. Kolodiazhnyi
4
National Institute for Materials Science
, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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a)
Electronic mail: kolodiazhnyi.taras@nims.go.jp
J. Appl. Phys. 123, 165704 (2018)
Article history
Received:
January 14 2018
Accepted:
April 10 2018
Citation
T. Charoonsuk, N. Vittayakorn, T. Kolodiazhnyi; Disorder-induced f-electron localization in Nb and Y co-doped CeO2. J. Appl. Phys. 28 April 2018; 123 (16): 165704. https://doi.org/10.1063/1.5022386
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