Effect of grain boundaries in La0.84Sr0.16CoO3−δ on oxygen diffusivity and surface exchange kinetics

2021 ◽  
Author(s):  
Natalia Porotnikova ◽  
Andrei Farlenkov ◽  
Sergey Naumov ◽  
Maxim Vlasov ◽  
Anna Khodimchuk ◽  
...  
Keyword(s):  
Single Crystal ◽  
Grain Boundaries ◽  
Gas Phase ◽  
Oxygen Exchange ◽  
Polycrystalline Specimen ◽  
Surface Exchange ◽  
Oxygen Diffusivity ◽  
Exchange Kinetics ◽  
Oriented Single Crystal

The 16O/18O oxygen exchange kinetics between the gas phase and the oriented single crystal and polycrystalline specimen has been studied; the rates of individual stages of oxygen exchange have been calculated and discussed.

Oxygen surface exchange kinetics of Ba0.5Sr0.5Co0.8Fe0.2O3−δ

2020 ◽  
Vol 22 (18) ◽  
pp. 10158-10169
Author(s):  
V. A. Eremin ◽  
M. V. Ananyev ◽  
H. J. M. Bouwmeester ◽  
E. Kh. Kurumchin ◽  
Ch.-Y. Yoo
Keyword(s):  
Gas Phase ◽  
Oxygen Exchange ◽  
Oxide Surface ◽  
Surface Exchange ◽  
Exchange Kinetics ◽  
Kinetics Of ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

The mechanism of oxygen exchange between the gas phase and Ba0.5Sr0.5Co0.8Fe0.2O3−δ oxide was evaluated by considering the inhomogeneity of the oxide surface.

Oxygen surface exchange and diffusion in mayenite single crystal

2019 ◽  
Vol 21 (44) ◽  
pp. 24740-24748 ◽  
Author(s):  
Anna S. Tolkacheva ◽  
Sergey N. Shkerin ◽  
Natalia M. Porotnikova ◽  
Mikhail V. Kuznetsov ◽  
Sergey V. Naumov ◽  
...  
Keyword(s):  
Single Crystal ◽  
Gas Phase ◽  
Surface Exchange ◽  
And Diffusion ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Oxygen surface exchange and diffusion in Ca12Al14O33±δ single crystal were studied by a unique in situ method based on isotope equilibration in the gas phase.

Surface Oxygen Exchange Kinetics in Oxide-Ion Conducting Solids

1992 ◽  
Vol 293 ◽  
Author(s):  
Bernard A. Boukamp ◽  
H.J.M. Bouwmeester ◽  
H. Verweij ◽  
A.J. Burggraaf
Keyword(s):  
Dissociative Adsorption ◽  
Oxygen Exchange ◽  
Surface Oxygen ◽  
Surface Exchange ◽  
Oxygen Ion ◽  
Exchange Kinetics ◽  
Ion Conducting ◽  
Singly Charged ◽  
Rate Limiting ◽  
Ion Conducting Solids

AbstractThe surface oxygen exchange on oxides with high oxygen ion mobility is modelled with a two step reaction with adsorbed mono-atomic oxygen species as intermediate. Interpretation of the Po2 dependence of the exchange rates, following from this model, indicates that these adsorbed oxygen atoms are singly charged.For the stabilized δ-Bi2O3 solid electrolyte a good agreement has been found between the isotope exchange model and the electrochemical study of the oxygen exchange using gold electrodes. For the mixed La-Sr cobaltite perovskite a change in the surface exchange reaction is observed going from room temperature to 600°C. Indications are that above 450°C the bulk exchange is rate limiting with a (Po2)−1 dependence while below this temperature it is assumed that the dissociative adsorption is rate limiting with a (Po2)1/2 dependence.

Oxygen isotope exchange in La2NiO4±δ

2016 ◽  
Vol 18 (13) ◽  
pp. 9102-9111 ◽  
Author(s):  
M. V. Ananyev ◽  
E. S. Tropin ◽  
V. A. Eremin ◽  
A. S. Farlenkov ◽  
A. S. Smirnov ◽  
...  
Keyword(s):  
Gas Phase ◽  
Isotope Exchange ◽  
Exchange Method ◽  
Surface Exchange ◽  
Oxygen Isotope Exchange ◽  
Exchange Kinetics ◽  
And Diffusion ◽  
Oxygen Surface Exchange ◽  
Experimental Rig ◽  
Isotope Exchange Method

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.

scholarly journals Surface chemistry of La0.6Sr0.4CoO3−δ thin films and its impact on the oxygen surface exchange resistance

2015 ◽  
Vol 3 (45) ◽  
pp. 22759-22769 ◽  
Author(s):  
Ghislain M. Rupp ◽  
Helena Téllez ◽  
John Druce ◽  
Andreas Limbeck ◽  
Tatsumi Ishihara ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Chemistry ◽  
Oxygen Exchange ◽  
Surface Exchange ◽  
Icp Ms ◽  
Exchange Kinetics ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Correlation between the surface chemistry of LSC thin films analyzed by LEIS and ICP-MS and the oxygen exchange kinetics.

Orientation dependent oxygen exchange kinetics on single crystal SrTiO3 surfaces

2012 ◽  
Vol 14 (34) ◽  
pp. 11953 ◽  
Author(s):  
Kian Kerman ◽  
Changhyun Ko ◽  
Shriram Ramanathan
Keyword(s):  
Single Crystal ◽  
Oxygen Exchange ◽  
Exchange Kinetics

The observation of defects on (100) CdTe surfaces by chemical etching

1992 ◽  
Vol 50 (2) ◽  
pp. 1424-1425
Author(s):  
M.E. Lee
Keyword(s):  
Single Crystal ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Chemical Etching ◽  
Crystalline Perfection ◽  
Crystalline Defects ◽  
High Incidence ◽  
Crystallographic Defects ◽  
Cdznte Substrates ◽  
Device Technology

The crystalline perfection of bulk CdTe substrates plays an important role in their use in infrared device technology. The application of chemical etchants to determine crystal polarity or the density and distribution of crystallographic defects in (100) CdTe is not well understood. The lack of data on (100) CdTe surfaces is a result of the apparent difficulty in growing (100) CdTe single crystal substrates which is caused by a high incidence of twinning. Many etchants have been reported to predict polarity on one or both (111) CdTe planes but are considered to be unsuitable as defect etchants. An etchant reported recently has been considered to be a true defect etchant for CdTe, MCT and CdZnTe substrates. This etchant has been reported to reveal crystalline defects such as dislocations, grain boundaries and inclusions in (110) and (111) CdTe. In this study the effect of this new etchant on (100) CdTe surfaces is investigated.The single crystals used in this study were (100) CdTe as-cut slices (1mm thickness) from Bridgman-grown ingots.

Fast oxygen exchange kinetics of pore-free Bi1−xSrxFeO3−δ thin films

2011 ◽  
Vol 13 (37) ◽  
pp. 16530 ◽  
Author(s):  
Anja Wedig ◽  
Rotraut Merkle ◽  
Benjamin Stuhlhofer ◽  
Hanns-Ulrich Habermeier ◽  
Joachim Maier ◽  
...  
Keyword(s):  
Thin Films ◽  
Oxygen Exchange ◽  
Exchange Kinetics ◽  
Kinetics Of

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.

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