Colossal oxygen vacancy formation at a fluorite-bixbyite interface.

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ID: 100028
2020
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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 CeO and the bixbyite YO is found to induce a charge modulation between Y and Ce 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.
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lee2020colossalnature Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
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;
Journal Nature communications
Year 2020
DOI
10.1038/s41467-020-15153-8
URL
Keywords
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