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- R. E. Youngman
- Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.
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- S. T. Haubrich
- Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.
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- J. W. Zwanziger
- Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.
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- M. T. Janicke
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, USA.
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- B. F. Chmelka
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, USA.
書誌事項
- 公開日
- 1995-09-08
- DOI
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- 10.1126/science.269.5229.1416
- 公開者
- American Association for the Advancement of Science (AAAS)
この論文をさがす
説明
<jats:p> Ordering at short-length scales is a universal feature of the glassy state. Experiments on boron oxide and other materials indicate that ordering on mesoscopic-length scales may also be universal. The high-resolution nuclear magnetic resonance (NMR) measurements of oxygen in boron oxide glass presented here provide evidence for structural units responsible for ordering on short- and intermediate-length scales. At the molecular level, planar BO <jats:sub>3/2</jats:sub> units accounted for the local ordering. Oxygen-17 NMR spectra resolved detailed features of the inclusion of these units in boroxol rings, oxygen bridging two rings, and oxygen shared between two nonring BO <jats:sub>3/2</jats:sub> units. On the basis of these and corroborative boron-11 NMR and scattering results, boron oxide glass consists of domains that are rich or poor in boroxol rings; these domains are proposed to be the structural basis of intermediate-range order in glassy boron oxide. </jats:p>
収録刊行物
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- Science
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Science 269 (5229), 1416-1420, 1995-09-08
American Association for the Advancement of Science (AAAS)