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- Title
Colossal oxygen vacancy formation at a fluorite-bixbyite interface.
- Authors
Lee, Dongkyu; Gao, Xiang; Sun, Lixin; Jee, Youngseok; Poplawsky, Jonathan; Farmer, Thomas O.; Fan, Lisha; Guo, Er-Jia; Lu, Qiyang; Heller, William T.; Choi, Yongseong; Haskel, Daniel; Fitzsimmons, Michael R.; Chisholm, Matthew F.; Huang, Kevin; Yildiz, Bilge; Lee, Ho Nyung
- Abstract
Oxygen vacancies in complex oxides are indispensable for information and energy technologies. There are several means to create oxygen vacancies in bulk materials. However, the use of ionic interfaces to create oxygen vacancies has not been fully explored. Herein, we report an oxide nanobrush architecture designed to create high-density interfacial oxygen vacancies. An atomically well-defined (111) heterointerface between the fluorite CeO2 and the bixbyite Y2O3 is found to induce a charge modulation between Y3+ and Ce4+ ions enabled by the chemical valence mismatch between the two elements. Local structure and chemical analyses, along with theoretical calculations, suggest that more than 10% of oxygen atoms are spontaneously removed without deteriorating the lattice structure. Our fluorite–bixbyite nanobrush provides an excellent platform for the rational design of interfacial oxide architectures to precisely create, control, and transport oxygen vacancies critical for developing ionotronic and memristive devices for advanced energy and neuromorphic computing technologies. Oxygen vacancies can impart interesting properties in complex oxides, but specific architectures designed to create high-density oxygen vacancies are largely unknown. Here the authors report a fluorite-bixbyite nanobrush platform to tune interfacial oxygen and show that an atomically well-defined heterointerface can induce charge modulation.
- Subjects
OXYGEN; ARCHITECTURAL design; CHEMICAL structure; BULK solids; CERIUM oxides; ANALYTICAL chemistry; YTTRIUM oxides
- Publication
Nature Communications, 2020, Vol 11, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-020-15153-8