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
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
收藏
页码:9102 / 9111
页数:10
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