Электронный каталог

Статья

Zakharov, D.M.
Comprehensive Study of O&sub(2) and H&sub(2)O Interaction with La&sub(0.9)Sr&sub(0.1)ScO&sub(3–*d) Oxide / D.M.Zakharov, S.V.Sumnikov, [et al.] // Surfaces and Interfaces [Electronic resource]. – 2024. – Vol. 48. – P. 104140. – URL: https://doi.org/10.1016/j.surfin.2024.104140. – Bibliogr.: 80.

In this paper we study the processes of O&sub(2) and H&sub(2)O interaction with La&sub(0.9)Sr&sub(0.1)ScO&sub(3–*d). Using high temperature neutron powder diffraction (HT-NPD), the evolution of crystal structure and water uptake was investigated in the temperature range 25–700&sup(o)C at 21.3 kPa in O&sub(2) and O&sub(2) + D&sub(2)O atmospheres. The results of HT-NPD show the influence of the water uptake by La&sub(0.9)Sr&sub(0.1)ScO&sub(3–*d) 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&sup(o)C at pO&sub(2) = 5.1, 12.2 and 21.3 kPa in dry and humid (pH&sub(2)O = 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&sub(2) humidification on the oxygen surface exchange is discussed.



Спец.(статьи,препринты) = С 342 г1 - Замедление и диффузия нейтронов. Дифракция
ОИЯИ = ОИЯИ (JINR)2024
Бюллетени = 25/024