Surface Structure of KIO3 Grown by Heterogeneous Reaction of Ozone with KI (001)

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• 作者：Matthew A. Brown ; Zhi Liu ; Paul D. Ashby ; Apurva Mehta ; Ronald L. Grimm ; John C. Hemminger
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：November 27, 2008
• 年：2008
• 卷：112
• 期：47
• 页码：18287-18290
• 全文大小：138K
• 年卷期：v.112,no.47(November 27, 2008)
• ISSN：1932-7455

文摘

The crystal structure of KIO₃ grown by heterogeneous surface oxidation of KI (001) with ozone is reported. Under ambient reaction conditions (RH 35%, room temperature) a thick layer of KIO₃ grows at the gas−solid interface. Two doublets are present in the I(4d) X-ray photoelectron spectroscopy structure measurements, characteristic of unreacted KI (I⁻) from the substrate and the oxidized KIO₃ (I⁵⁺) reaction product. X-ray diffraction measurements confirm the presence at the interface of randomly oriented polycrystalline-triclinic KIO₃ with an average particle diameter of 15 nm. KIO₃ particle diameters determined from the X-ray diffraction peak widths are consistent with the results of atomic force microscopy. There is no X-ray powder diffraction evidence to suggest that the underlying KI substrate is altered in any manner during this heterogeneous interfacial reaction.