Oxygen isotope exchange in La2NiO4±δ

被引：72

作者：

Ananyev, M. V. ^{[1
,2
]}

Tropin, E. S. ^{[1
]}

Eremin, V. A. ^{[1
]}

Farlenkov, A. S. ^{[1
]}

Smirnov, A. S. ^{[3
]}

Kolchugin, A. A. ^{[1
]}

Porotnikova, N. M. ^{[1
]}

Khodimchuk, A. V. ^{[1
,2
]}

Berenov, A. V. ^{[4
]}

Kurumchin, E. Kh. ^{[1
]}

机构：

[1] UB RAS, Lab Electrochem Mat Sci, Inst High Temp Electrochem, Ekaterinburg 620137, Russia

[2] Ural Fed Univ, Dept Chem Engn, Ekaterinburg 620990, Russia

[3] UB RAS, Lab Deformat Mech, Inst Engn Sci, Ekaterinburg 620049, Russia

[4] Univ London Imperial Coll Sci Technol & Med, Exhibition Rd, London SW7 2AZ, England

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2016年 / 18卷 / 13期

基金：

俄罗斯科学基金会;

关键词：

SURFACE EXCHANGE; TRACER DIFFUSION; LA2NIO4+DELTA; LA2-XSRXNIO4+DELTA; TRANSPORT; KINETICS; OXIDES;

D O I：

10.1039/c5cp05984d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Oxygen surface exchange kinetics and diffusion have been studied by the isotope exchange method with gas phase equilibration using a static circulation experimental rig in the temperature range of 600-800 degrees C and oxygen pressure range of 0.13-2.5 kPa. A novel model which takes into account distributions of the dissociative adsorption and incorporation rates has been developed. The rates of the elementary stages have been calculated. The rate-determining stages for a La2NiO4 +/-delta polycrystalline specimen have been discussed. The diffusion activation energies calculated using the gas phase equilibration method (1.4 eV) differ significantly from those calculated using isotope exchange depth profiling (0.5-0.8 eV), which was attributed to the influence of different oxygen diffusion pathways.

引用

页码：9102 / 9111

页数：10

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