Original language | English |
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Pages (from-to) | 1308-1309 |
Number of pages | 2 |
Journal | Microscopy and Microanalysis |
Volume | 22 |
Issue number | S3 |
DOIs |
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State | Published - Jul 1 2016 |
Funding
with A-site cation ordering within each domain. The reason that the domain structure was overlooked by STEM is due to a combination of a small feature size (1-3nm) and the randomly oriented ordered domain structure in 3-D space. The typical thickness of a TEM specimen is ~20nm and since S/TEM imaging presents a projection of all the atoms comprising the specimen thickness, the image contrast resulting from cation ordering become averaged (or blurred) in the resulting image when the specimen thickness is larger than that of the domain size. The true observation of extremely small mesoscopic features involves a significant improvement of the TEM specimen preparation method and a significant reduction of surface contamination on the TEM specimen. A specimen thickness of ~5nm was finally achieved (a detailed description of the sample preparation method will be provided in the presentation). The formation of such a unique domain structure in 1350LLTO is a key factor towards achieving its high ionic conductivity. Molecular dynamics simulations confirmed that the conductivity enhancement results from maximizing ion transport pathways in 3-D that is introduced by the unique domain structure. These results reconcile the long-standing inconsistency between microstructure and conductivity in LLTO, and indicate that a delicate balance between ordered and random atomic configurations is crucial in material design for fast solid-state ionic conductors. [6] References: [1] M Park et al., J. Power Sources 195 (2010), p. 7904. [2] G. Murch et al., Crit. Rev. Solid State Mater. Sci. 15 (1989) p. 345. [3] J. Li et al., Adv. Energy Mater. 5 (2014) p. 1408. [4] Y. Wang et al., Nature Materials 14 (2015) p. 1026. [5] C. Ma et al., Energy Environ. Sci. 7 (2014) p. 1638. [6] The solid electrolyte work was sponsored by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Sciences and Engineering Division. Microscopy research was supported by the Center for Nanophase Materials Sciences (CNMS), which is a DOE Office of Science User Facility.