Improved oxygen surface exchange kinetics at grain boundaries in nanocrystalline yttria-stabilized zirconia

2012 ◽  
Vol 2 (3) ◽  
pp. 107-111 ◽  
Author(s):  
Joong Sun Park ◽  
Timothy P. Holme ◽  
Joon Hyung Shim ◽  
Fritz B. Prinz
Keyword(s):  
Grain Boundaries ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Surface Exchange ◽  
Exchange Kinetics ◽  
Image Position ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Abstract

Oxygen Diffusion and Surface Exchange in Yttria-Stabilized Zirconia and Gadolinia-Doped Ceria Ceramics at Low Temperatures

2009 ◽  
Vol 289-292 ◽  
pp. 769-774 ◽  
Author(s):  
Kazimierz Kowalski
Keyword(s):  
Low Temperatures ◽  
Oxygen Diffusion ◽  
Isotopic Labeling ◽  
Yttria Stabilized Zirconia ◽  
Doped Ceria ◽  
Stabilized Zirconia ◽  
Surface Exchange ◽  
Self Diffusion ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Oxygen self-diffusion and oxygen surface exchange investigations in the yttria-stabilized zirconia (3 and 8 mol% of Y2O3) and in the gadolinia-doped ceria (10 and 20 mol% of Gd2O3) ceramics in the temperature range from 250 to 450°C were performed by means of the 18O isotopic labeling and the SIMS profiling methods. The activation energies of these processes were determined. The results were discussed in comparison with the literature data extrapolated from higher temperatures.

scholarly journals Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La1.85Sr0.15CuO4 Thin Films

2021 ◽  
Vol 11 (9) ◽  
pp. 3778
Author(s):  
Gene Yang ◽  
So-Yeun Kim ◽  
Changhee Sohn ◽  
Jong K. Keum ◽  
Dongkyu Lee
Keyword(s):  
Thin Films ◽  
Oxygen Vacancies ◽  
Elevated Temperatures ◽  
Surface Exchange ◽  
Electrical Conductivity Relaxation ◽  
Exchange Kinetics ◽  
Relaxation Curves ◽  
Kinetics Of ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Considerable attention has been directed to understanding the influence of heterointerfaces between Ruddlesden–Popper (RP) phases and ABO3 perovskites on the kinetics of oxygen electrocatalysis at elevated temperatures. Here, we report the effect of heterointerfaces on the oxygen surface exchange kinetics by employing heteroepitaxial oxide thin films formed by decorating LaNiO3 (LNO) on La1.85Sr0.15CuO4 (LSCO) thin films. Regardless of LNO decoration, tensile in-plane strain on LSCO films does not change. The oxygen surface exchange coefficients (kchem) of LSCO films extracted from electrical conductivity relaxation curves significantly increase with partial decorations of LNO, whereas full LNO coverage leads to the reduction in the kchem of LSCO films. The activation energy for oxygen exchange in LSCO films significantly decreases with partial LNO decorations in contrast with the full coverage of LNO. Optical spectroscopy reveals the increased oxygen vacancies in the partially covered LSCO films relative to the undecorated LSCO film. We attribute the enhanced oxygen surface exchange kinetics of LSCO to the increased oxygen vacancies by creating the heterointerface between LSCO and LNO.

scholarly journals Effect of La0.6Sr0.4Co0.2Fe0.8O3-δ microstructure on oxygen surface exchange kinetics

2016 ◽  
Vol 288 ◽  
pp. 6-9 ◽  
Author(s):  
Katherine Develos-Bagarinao ◽  
Haruo Kishimoto ◽  
Jeffrey De Vero ◽  
Katsuhiko Yamaji ◽  
Teruhisa Horita
Keyword(s):  
Surface Exchange ◽  
Exchange Kinetics ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface
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