Effect of doping with iron and cations deficiency in the high conductive electrolyte La0.8Sr0.2Ga0.8Mg0.2O3–δ on oxygen exchange kinetics

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL Solid State Ionics Pub Date : 2024-09-18 DOI:10.1016/j.ssi.2024.116704

Natalia Porotnikova , Anna Khodimchuk , Egor Gordeev , Denis Osinkin

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Abstract

The oxygen isotope exchange method was used to investigate the kinetics of the interaction between gaseous oxygen and LaGaO₃-based oxides in a temperature range of 650 to 850 °C, with an oxygen pressure of 10 mbar. The stable isotopes of ¹⁸O/¹⁶O were used as labelled ions. The temperature dependencies of the heterogeneous oxygen exchange rate (r_H), the oxygen dissociative adsorption rate (r_a), the oxygen incorporation rate (r_i), and the oxygen diffusion coefficient (D) were determined. A comparative analysis of the r_H and D values for La_0.8Sr_0.2Ga_0.8Mg_0.2O_3–δ was carried out with a view to identifying any similarities or differences when compared with the literature data on oxides with similar compositions. The effect of ${Fe}_{Ga}^{'}$ doping and the creation of an A-sublattice deficiency on the kinetic characteristics were investigated using the (La_0.8Sr_0.2)_0.98Ga_0.7Fe_0.1Mg_0.2O_3–δ oxide as a case example. Correlations between the rate-determining step of oxygen exchange and the modification of the oxide composition were identified.

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高导电性电解质 La0.8Sr0.2Ga0.8Mg0.2O3-δ 中铁掺杂和阳离子缺乏对氧气交换动力学的影响

采用氧同位素交换法研究了气态氧与基于 LaGaO3 的氧化物在 650 至 850 °C 温度范围和 10 毫巴氧压下的相互作用动力学。稳定同位素 18O/16O 被用作标记离子。测定了异质氧交换速率（rH）、氧离解吸附速率（ra）、氧掺入速率（ri）和氧扩散系数（D）的温度依赖性。对 La0.8Sr0.2Ga0.8Mg0.2O3-δ 的 rH 值和 D 值进行了比较分析，以便找出与具有类似成分的氧化物的文献数据相比存在的异同。以(La0.8Sr0.2)0.98Ga0.7Fe0.1Mg0.2O3-δ氧化物为例，研究了掺杂 FeGa′和产生 A 亚晶格缺陷对动力学特性的影响。确定了氧交换速率决定步骤与氧化物成分改变之间的相关性。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.