Lepidocrocite-Type Titanate Formation from Isostructural Prestructures under Hydrothermal Reactions: Observation by Synchrotron X-ray Total Scattering Analyses

Lepidocrocite-Type Titanate Formation from Isostructural Prestructures under Hydrothermal Reactions: Observation by Synchrotron X-ray Total Scattering Analyses
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水热反应下等结构预结构形成纤铁矿型钛酸盐:通过同步加速器 X 射线全散射分析观察

DOI:
10.1021/acsomega.8b01693
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发表时间:
2018
期刊:
影响因子:
4.1
通讯作者:
Ohara Koji
Ohara Koji
中科院分区:
化学3区
文献类型:
--
作者:
Tominaka Satoshi;Yamada Hiroki;Hiroi Satoshi;Kawaguchi Saori I.;Ohara Koji

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二氧化钛的形成,如金红石和锐钛矿,已知是通过在水热条件下形成锂镁石型层状结构进行的,但这种中间体的成核仍然不是很清楚。本文通过原位时间分辨对分布函数分析跟踪结构变化,观察了水热条件下锂镁石型层状钛酸盐的成核过程。我们发现,即使在碱性水溶液中进行热处理之前,就已经形成了具有-lt;1 nm结构域的钛酸盐团簇或波纹状层状预构造物,具有轻铁镁石类型的连接性。热处理后,直接从预制结构中生长出二维层状结构,而不是从溶解在溶液中的无定形聚合物氢氧化物中生长出来。因此,在水热条件下,类锂钛矿预构的形成是形成层状钛酸盐的关键。
The formation of titanium dioxides, such as rutile and anatase, is known to proceed through the formation of a lepidocrocite-type layered structure under hydrothermal conditions, but the nucleation of this intermediate is still not understood well. Here, the nucleation of lepidocrocite-type layered titanates under hydrothermal conditions is observed by tracking the structural changes by in situ time-resolved pair distribution function analyses. We found that titanate clusters or corrugated layered prestructures having <1 nm domains with lepidocrocite-type connectivity were formed even before thermal treatment in alkaline aqueous solution. Upon thermal treatment, a two-dimensional layered structure grew directly from the prestructure, not from the amorphous polymeric hydroxide dissolved in the solution. Thus, we conclude that the formation of the lepidocrocite-like prestructure is the key for forming a layered titanate under hydrothermal conditions.
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