Kinetic study of GeO disproportionation into a GeO2/Ge system using x-ray photoelectron spectroscopy
Kinetic study of GeO disproportionation into a GeO2/Ge system using x-ray photoelectron spectroscopy
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DOI：
10.1063/1.4738892
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发表时间：
2012-08
影响因子：
4
通讯作者：
Shengkai Wang;Honggang Liu;A. Toriumi
中科院分区：
文献类型：
--
作者：
Shengkai Wang;Honggang Liu;A. Toriumi
用X射线光电子能谱研究了GeO向GeO_2和Ge的转化。给出了超高真空退火后2GeO → GeO_2 + Ge反应的直接证据。通过动力学和热力学计算，得到GeO分解的活化能约为0.7 ± 0.2eV。考虑GeO网络中氧的传递，建立了GeO分解动力学模型。讨论了GeO 2/Ge界面反应引起的GeO脱附与GeO反硝化的关系，并从氧空位的角度解释了GeO 2/Ge界面反应引起的GeO脱附与GeO反硝化成Ge和GeO 2之间的明显矛盾。
GeO disproportionation into GeO2 and Ge is studied through x-ray photoelectron spectroscopy. Direct evidence for the reaction 2GeO → GeO2 + Ge after annealing in ultra-high vacuum is presented. Activation energy for GeO disproportionation is found to be about 0.7 ± 0.2 eV through kinetic and thermodynamic calculations. A kinetic model of GeO disproportionation is established by considering oxygen transfer in the GeO network. The relationship between GeO disproportionation and GeO desorption induced by GeO2/Ge interfacial reaction is discussed, and the apparent contradiction between GeO desorption via interfacial redox reaction and GeO disproportionation into Ge and GeO2 is explained by considering the oxygen vacancy.