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Probing of Triply Coordinated Oxygen in Amorphous Al2O3
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-12-21 00:00:00 , DOI: 10.1021/acs.jpclett.7b03027 Sung Keun Lee 1, 2 , Saebom Ryu 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-12-21 00:00:00 , DOI: 10.1021/acs.jpclett.7b03027 Sung Keun Lee 1, 2 , Saebom Ryu 1
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Although anomalous melt properties have been attributed to the presence of triply coordinated oxygen ([3]O), the presence of [3]O 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 17O NMR spectrum for amorphous Al2O3 and reveal the hidden nature of [3]O. 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 [3]O allows us to microscopically constrain its glass-forming ability and unique two-step crystallization paths of amorphous Al2O3 through the annihilation of glassy [3]O with multiple [5]Al species.
中文翻译：
非晶态Al 2 O 3中三重配位氧的探测
尽管异常熔体性质归因于三配位氧（[3] O）的存在，但共价无定形氧化物中[3] O的存在尚未通过实验得到揭示。这种验证是眼镜物理化学研究中的圣杯。我们报道了无定形Al 2 O 3的第一个17 O NMR光谱，并揭示了[3] O的隐藏性质。氧三甲苯的详细NMR特征与晶体类似物的估计特征不同，从而表明其独特的结构。这个明确的证据表明[3]的存在O使我们能够通过玻璃化[3] O与多种[5] Al物种的ation灭，在微观上限制其玻璃形成能力和无定形Al 2 O 3独特的两步结晶路径。
更新日期：2017-12-21
中文翻译：
非晶态Al 2 O 3中三重配位氧的探测
尽管异常熔体性质归因于三配位氧（[3] O）的存在，但共价无定形氧化物中[3] O的存在尚未通过实验得到揭示。这种验证是眼镜物理化学研究中的圣杯。我们报道了无定形Al 2 O 3的第一个17 O NMR光谱，并揭示了[3] O的隐藏性质。氧三甲苯的详细NMR特征与晶体类似物的估计特征不同，从而表明其独特的结构。这个明确的证据表明[3]的存在O使我们能够通过玻璃化[3] O与多种[5] Al物种的ation灭，在微观上限制其玻璃形成能力和无定形Al 2 O 3独特的两步结晶路径。
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