Oxygen Vacancy Distribution in Yttrium-Doped Ceria from ⁸⁹Y-⁸⁹Y Correlations via Dynamic Nuclear Polarization Solid-State NMR.

ABSTRACT: Comprehending the oxygen vacancy distribution in oxide ion conductors requires structural insights over various length scales: from the local coordination preferences to the possible formation of agglomerates comprising a large number of vacancies. In Y-doped ceria, ⁸⁹Y NMR enables differentiation of yttrium sites by quantification of the oxygen vacancies in their first coordination sphere. Because of the extremely low sensitivity of ⁸⁹Y, longer-range information was so far not available from NMR. Herein, we utilize metal ion-based dynamic nuclear polarization, where polarization from Gd(III) dopants provides large sensitivity enhancements homogeneously throughout the bulk of the sample. This enables following ⁸⁹Y-⁸⁹Y homonuclear dipolar correlat

SUBMITTER: Jardon-Alvarez D 

PROVIDER: S-EPMC8006133 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature