Oxygen isotope exchange in La2NiO4±δ
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
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 °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±δ 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.
Date Issued
2016-02-25
Date Acceptance
2016-02-19
Citation
Physical Chemistry Chemical Physics, 2016, 18, pp.9102-9111
ISSN
1463-9084
Publisher
Royal Society of Chemistry
Start Page
9102
End Page
9111
Journal / Book Title
Physical Chemistry Chemical Physics
Volume
18
Copyright Statement
© The Royal Society of Chemistry 2016
Subjects
Science & Technology
Physical Sciences
Chemistry, Physical
Physics, Atomic, Molecular & Chemical
Chemistry
Physics
SURFACE EXCHANGE
TRACER DIFFUSION
LA2NIO4+DELTA
LA2-XSRXNIO4+DELTA
TRANSPORT
KINETICS
OXIDES
Chemical Physics
02 Physical Sciences
03 Chemical Sciences
Publication Status
Published