Direct Measurement of Electronic Band Structures at Oxide Grain Boundaries

Nano Letters
Jiake WeiYuichi Ikuhara

Abstract

Grain boundaries (GBs) modulate the macroscopic properties in polycrystalline materials because they have different atomic and electronic structures from the bulk. Despite the progress on the understanding of GB atomic structures, knowledge of the localized electronic band structures is still lacking. Here, we experimentally characterized the atomic structures and the band gaps of four typical GBs in α-Al2O3 by scanning transmission electron microscopy and valence electron energy-loss spectroscopy (EELS). It was found that the band gaps of the GBs are narrowed by 0.5-2.1 eV compared with that of 8.8 eV in the bulk. By combing core-loss EELS with first-principles calculations, we elucidated that the band gap reductions directly correlate with the decrease of the coordination numbers of Al and O ions at the GBs. These results provide in-depth understanding between the local atomic and electronic band structures for GBs and demonstrate a novel electronic-structure analysis for crystalline defects.

References

Jul 15, 1991·Physical Review. B, Condensed Matter·W L O'BrienD L Ederer
Mar 23, 2006·Micron : the International Research and Review Journal for Microscopy·M Stöger-PollachH W Zandbergen
Jun 21, 2006·The Journal of Chemical Physics·Axel D Becke, Erin R Johnson
Oct 7, 1994·Science·M M McGibbonV P Dravid
Oct 14, 2008·Nature Materials·Keith P McKenna, Alexander L Shluger
Jun 12, 2009·Ultramicroscopy·Jucheol ParkGyeong-Su Park
May 3, 2014·Physical Review Letters·Chen LiYanfa Yan
Feb 18, 2015·Nature Communications·Yu Li HuangAndrew T S Wee
May 4, 2016·Nano Letters·Yu Li HuangAndrew T S Wee
Dec 24, 2018·Ultramicroscopy·O L KrivanekT C Lovejoy

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Citations

Jan 13, 2021·Nature Materials·Jiake WeiYuichi Ikuhara
Apr 9, 2021·Nature Communications·Qianwei HuangXiaozhou Liao
May 13, 2021·Proceedings of the National Academy of Sciences of the United States of America·Kun XuJing Zhu

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