Colossal oxygen vacancy formation at a fluorite-bixbyite interface.

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 wi

SUBMITTER: Lee D 

PROVIDER: S-EPMC7069997 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature