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Revealing Strain Effects on the Chemical Composition of Perovskite Oxide Thin Films Surface, Bulk, and Interfaces
Author(s) -
van den Bosch Celeste A. M.,
Cavallaro Andrea,
Moreno Roberto,
Cibin Giannantonio,
Kerherve Gwilherm,
Caicedo José M.,
Lippert Thomas K.,
Doebeli Max,
Santiso José,
Skinner Stephen J.,
Aguadero Ainara
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201901440
Subject(s) - materials science , oxide , thin film , chemical bond , strain (injury) , ultimate tensile strength , perovskite (structure) , strontium , chemical engineering , oxygen , epitaxy , diffusion , composite material , nanotechnology , layer (electronics) , thermodynamics , metallurgy , chemistry , organic chemistry , medicine , engineering , physics
Understanding the effects of lattice strain on oxygen surface and diffusion kinetics in oxides is a controversial subject that is critical for developing efficient energy storage and conversion materials. In this work, high‐quality epitaxial thin films of the model perovskite La 0.5 Sr 0.5 Mn 0.5 Co 0.5 O 3− δ (LSMC), under compressive or tensile strain, are characterized with a combination of in situ and ex situ bulk and surface‐sensitive techniques. The results demonstrate a nonlinear correlation of mechanical and chemical properties as a function of the operation conditions. It is observed that the effect of strain on reducibility is dependent on the “effective strain” induced on the chemical bonds. In‐plain strain, and in particular the relative BO length bond, is the key factor controlling which of the B‐site cation can be reduced preferentially. Furthermore, the need to use a set of complimentary techniques to isolate different chemically induced strain effects is proven. With this, it is confirmed that tensile strain favors the stabilization of a more reduced lattice, accompanied by greater segregation of strontium secondary phases and a decrease of oxygen exchange kinetics on LSMC thin films.