Campus Units

Materials Science and Engineering

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

9-9-2020

Journal or Book Title

Advanced Functional Materials

First Page

2004607

DOI

10.1002/adfm.202004607

Abstract

The dynamics of oxygen vacancies under external stimuli dominates the performance of many solid‐state devices, including capacitors, oxide memristors, anionic conductors, etc. By means of in situ transmission electron microscopy, it is found in BaTiO3 perovskite nanocrystals that formation of oxygen vacancies due to electrical stressing renders the oxide amorphizable under electron beam illumination, suggesting the presence of a threshold concentration of oxygen vacancy affecting the structural stability of BaTiO3 crystals upon high energy radiation. In contrast to the structural change, the resistivity of the nanocrystal seems not liable to the amorphization prior to dielectric breakdown at higher voltage bias. It is proposed that an increase in oxygen vacancy content promotes oxygen mobility in the perovskite structure allowing electron beam induced electric field to modify the local structure and composition. The in situ observations reveal the central role of oxygen vacancies in the structural stability of perovskites which is of paramount importance to their applications in extreme environments and suggest a potential new route to micro‐processing perovskite oxides using the electron beam via oxygen vacancy management without severely compromising the electric property.

Comments

This is the peer-reviewed version of the following article: Tian, Xinchun, Geoff L. Brennecka, and Xiaoli Tan. "Structural Instability in Electrically Stressed, Oxygen Deficient BaTiO3 Nanocrystals." Advanced Functional Materials (2020): 2004607, which has been published in final form at DOI: 10.1002/adfm.202004607. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. Posted with permission.

Copyright Owner

Wiley‐VCH GmbH

Language

en

File Format

application/pdf

Available for download on Thursday, September 09, 2021

Published Version

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