Intermittent Defect Fluctuations in Oxide Heterostructures.

Autor: Zhang Q; X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA., Wan G; Material Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA., Starchenko V; Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA., Hu G; Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA., Dufresne EM; X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA., Zhou H; X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA., Jeen H; Department of Physics, Pusan National University, Busan, 46241, South Korea., Almazan IC; Material Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA., Dong Y; X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA., Liu H; Material Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA., Sandy AR; X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA., Sterbinsky GE; X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA., Lee HN; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA., Ganesh P; Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA., Fong DD; Material Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2023 Oct; Vol. 35 (42), pp. e2305383. Date of Electronic Publication: 2023 Sep 08.
DOI: 10.1002/adma.202305383
Abstrakt: The heterogeneous nature, local presence, and dynamic evolution of defects typically govern the ionic and electronic properties of a wide variety of functional materials. While the last 50 years have seen considerable efforts into development of new methods to identify the nature of defects in complex materials, such as the perovskite oxides, very little is known about defect dynamics and their influence on the functionality of a material. Here, the discovery of the intermittent behavior of point defects (oxygen vacancies) in oxide heterostructures employing X-ray photon correlation spectroscopy is reported. Local fluctuations between two ordered phases in strained SrCoO x with different degrees of stability of the oxygen vacancies are observed. Ab-initio-informed phase-field modeling reveals that fluctuations between the competing ordered phases are modulated by the oxygen ion/vacancy interaction energy and epitaxial strain. The results demonstrate how defect dynamics, evidenced by measurement and modeling of their temporal fluctuations, give rise to stochastic properties that now can be fully characterized using coherent X-rays, coupled for the first time to multiscale modeling in functional complex oxide heterostructures. The study and its findings open new avenues for engineering the dynamical response of functional materials used in neuromorphic and electrochemical applications.
(© 2023 UChicago Argonne, LLC and Oak Ridge National Laboratory. Advanced Materials published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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