4.8 Article

Probing of Triply Coordinated Oxygen in Amorphous Al2O3

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JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 9, 期 1, 页码 150-156

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AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b03027

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  1. Samsung Science and Technology Foundation (SSTF) [BA1401-07]

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Although anomalous melt properties have been attributed to the presence of triply coordinated oxygen (O-[3]), the presence of O-[3] in covalent amorphous oxides has not been revealed experimentally; such verification is the Holy Grail in the study of the physics and chemistry of glasses. We report the first O-17 NMR spectrum for amorphous Al2O3 and reveal the hidden nature of O-[3]. The detailed NMR characteristics of the oxygen tricluster are distinct from those estimated for the crystalline analogs, thus indicating its unique structure. This unambiguous evidence of the presence of O-[3] allows us to microscopically constrain its glass-forming ability and unique two-step crystallization paths of amorphous Al2O3 through the annihilation of glassy O-[3] with multiple Al-[5] species.

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