Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms11591
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Funding
- JST-CREST 'Phase Interface Science for Highly Efficient Energy Utilization', JST (Japan)
- Fusion Research Funds from 'World Premier International (WPI) Research Centre Initiative for Atoms, Molecules and Materials' programme of the MEXT of Japan
- Japan Society for the Promotion of Science (JSPS) [15K14116]
- Cross-ministerial Strategic Innovation Promotion Programme (SIP, Structural Materials for Innovation) of the Ministry of Agriculture, Forestry and Fisheries of Japan [D72]
- JST-PRESTO Materials research by Information Integration'' Initiative project (MI2I) of the Support Program for Starting Up Innovation Hub from JST
- MEXT Project of the SR Centre in Ritsumeikan University [R1405]
- MOST 973 of China [2015CB856800]
- National Natural Science Foundation of China [11327902, 51271113]
- Grants-in-Aid for Scientific Research [26310205, 15K14116] Funding Source: KAKEN
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Solid silicon monoxide is an amorphous material which has been commercialized for many functional applications. However, the amorphous structure of silicon monoxide is a long-standing question because of the uncommon valence state of silicon in the oxide. It has been deduced that amorphous silicon monoxide undergoes an unusual disproportionation by forming silicon-and silicon-dioxide-like regions. Nevertheless, the direct experimental observation is still missing. Here we report the amorphous structure characterized by angstrom-beam electron diffraction, supplemented by synchrotron X-ray scattering and computer simulations. In addition to the theoretically predicted amorphous silicon and silicon-dioxide clusters, suboxide-type tetrahedral coordinates are detected by angstrom-beam electron diffraction at silicon/silicon-dioxide interfaces, which provides compelling experimental evidence on the atomic-scale disproportionation of amorphous silicon monoxide. Eventually we develop a heterostructure model of the disproportionated silicon monoxide which well explains the distinctive structure and properties of the amorphous material.
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