In this paper we study the processes of O and HO interaction with LaSrScO. Using high temperature neutron powder diffraction (HT-NPD), the evolution of crystal structure and water uptake was investigated in the temperature range 25–700 °C at 21.3 kPa in O and O + DO atmospheres. The results of HT-NPD show the influence of the water uptake by LaSrScO bulk on the thermal expansion of the material. The kinetics of oxygen surface exchange was studied using pulsed isotope exchange technique. The measurements were carried out in the temperature range 300−900 °C at O = 5.1, 12.2 and 21.3 kPa in dry and humid (HO = 2.6 kPa) conditions. For the first time the physical model describing the kinetics of oxygen surface exchange between the mixture of oxygen and water in the gas phase and a solid oxide has been suggested. The model includes following steps: oxygen dissociative adsorption, oxygen incorporation, hydrogen surface diffusion, water adsorption and dissociation. The rate-determining step of the exchange is considered. The influence of O humidification on the oxygen surface exchange is discussed.

中文翻译：

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O2和H2O与La0.9Sr0.1ScO3-δ氧化物相互作用的综合研究

在本文中，我们研究了 O 和 H2O 与 LaSrScO 相互作用的过程。使用高温中子粉末衍射 (HT-NPD)，在 O 和 O + DO 气氛中，在 21.3 kPa、25–700 °C 的温度范围内研究了晶体结构和吸水率的演变。 HT-NPD 结果显示了 LaSrScO 块体吸水对材料热膨胀的影响。使用脉冲同位素交换技术研究了氧表面交换的动力学。测量在 300−900 °C 温度范围、O2 = 5.1、12.2 和 21.3 kPa、干燥和潮湿 (H2O = 2.6 kPa) 条件下进行。首次提出了描述气相氧和水的混合物与固体氧化物之间氧表面交换动力学的物理模型。该模型包括以下步骤：氧解离吸附、氧掺入、氢表面扩散、水吸附和解离。考虑交换的速率决定步骤。讨论了氧气加湿对氧气表面交换的影响。