Interface-dominated materials such as nanocrystalline thin films have emerged as an enthralling class of materials able to engineer functional properties of transition metal oxides widely used in energy and information technologies. In particular, it has been proven that strain-induced defects in grain boundaries of manganites deeply impact their functional properties by boosting their oxygen mass transport while abating their electronic and magnetic order. In this work, the origin of these dramatic changes is correlated for the first time with strong modifications of the anionic and cationic composition in the vicinity of strained grain boundary regions. We are also able to alter the grain boundary composition by tuning the overall cationic content in the films, which represents a new and powerful tool, beyond the classical space charge layer effect, for engineering electronic and mass transport properties of metal oxide thin films useful for a collection of relevant solid-state devices.
Bibliographical noteThis is the peer reviewed version of the following article: Chiabrera, F, Garbayo, I, López‐Conesa, L, Martín, G, Ruiz‐Caridad, A, Walls, M, Ruiz‐González, L, Kordatos, A, Núñez , M, Morata, A, Estradé , S, Chroneos, A, Peiró, F & Tarancón, A 2019, 'Engineering Transport in Manganites by Tuning Local Non-Stoichiometry in Grain Boundaries' Advanced Materials, vol. 31, no. 4, 1805360.which has been published in final form at 10.1002/adma.201805360. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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- grain boundaries
- interface-dominated materials
- local nonstoichiometry
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering