期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8358
关键词
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资金
- DOE [DE-FG02-01ER45945]
- NSF [DMR-1206320]
- DOE, Basic Energy Science, Material Science and Engineering Division [DE-AC02-98CH10886]
- Office of Science, Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
- Discovery Projects funding scheme of the Australian Research Council [DP110102228]
- Discovery Early Career Researcher Award from the Australian Research Council [DE130100739]
- U.S. Department of Energy (DOE) [DE-FG02-01ER45945] Funding Source: U.S. Department of Energy (DOE)
- Australian Research Council [DE130100739] Funding Source: Australian Research Council
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1507101] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1206320] Funding Source: National Science Foundation
Unique determination of the atomic structure of technologically relevant surfaces is often limited by both a need for homogeneous crystals and ambiguity of registration between the surface and bulk. Atomically resolved secondary-electron imaging is extremely sensitive to this registration and is compatible with faceted nanomaterials, but has not been previously utilized for surface structure determination. Here we report a detailed experimental atomic-resolution secondary-electron microscopy analysis of the c(6 x 2) reconstruction on strontium titanate (001) coupled with careful simulation of secondary-electron images, density functional theory calculations and surface monolayer-sensitive aberration-corrected plan-view high-resolution transmission electron microscopy. Our work reveals several unexpected findings, including an amended registry of the surface on the bulk and strontium atoms with unusual seven-fold coordination within a typically high surface coverage of square pyramidal TiO5 units. Dielectric screening is found to play a critical role in attenuating secondary-electron generation processes from valence orbitals.
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