Oxygen surface exchange and diffusion in Pr1.75Sr0.25Ni0.75Co0.25O4±δ

2019 ◽  
Vol 21 (9) ◽  
pp. 4779-4790 ◽  
Author(s):  
Evgeniy Tropin ◽  
Maxim Ananyev ◽  
Natalia Porotnikova ◽  
Anna Khodimchuk ◽  
Saim Saher ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Gas Phase ◽  
Isotope Exchange ◽  
Surface Exchange ◽  
Oxygen Isotope Exchange ◽  
And Diffusion ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Oxygen surface exchange and diffusion in Pr1.75Sr0.25Ni0.75Co0.25O4±δ have been investigated using two methods: pulsed isotope exchange (PIE) and oxygen isotope exchange with gas phase equilibration (IE GPE).

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.

Oxygen Isotope Exchange in Proton-Conducting Oxides Based on Lanthanum Scandates

2018 ◽  
pp. 70-87
Author(s):  
A. S. Farlenkov ◽  
A. V. Khodimchuk ◽  
N. A. Shevyrev ◽  
A. Yu. Stroeva ◽  
A. V. Fetisov ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Diffusion Coefficients ◽  
Isotope Exchange ◽  
Dissociative Adsorption ◽  
Surface Exchange ◽  
Oxygen Isotope Exchange ◽  
Conducting Oxides ◽  
Reducing Atmosphere ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

The method of oxygen isotope exchange with the gas phase equilibration have been used to obtain the temperature dependences of the oxygen surface exchange and diffusion coefficients with proton-conducting oxides La1–xSrxScO3–δ (x = 0; 0.04; 0.09) in the temperature range of 600−900°C at oxygen pressure 1.01 kPa. The paper determines that the diffusion and oxygen surface exchange coefficients increase with the increasing of the strontium content in the oxides. We have found out the rates of the individual stages of the oxygen exchange process on the surface of the oxides. It is shown that oxygen incorporation is rate-determining stage of the oxygen exchange on the surface of the undoped oxide, whereas for the strontium-doped oxides La1–xSrxScO3–δ (x = 0; 0.04; 0.09) with increasing of strontium concentration, the difference between the rates of dissociative adsorption and oxygen incorporation decreases so that for the oxide La0,91Sr0,09ScO3–δ the stage of dissociative adsorption of oxygen becomes rate-determining stage. The paper analyzes the possible reasons of these differences in oxygen surface exchange kinetics. Moreover, the paper using the obtained oxygen diffusion coefficients that have been recalculated in the oxygen-ionic conductivities according to the Nernst-Einstein equation performs the contributions of the oxygen-ion and proton components of the total conductivity of oxides La1–xSrxScO3–δ (x = 0; 0.04; 0.09) in the wet reducing atmosphere (pH2O = 2.35 kPa, pO2 = 10−15 Pa). Proton transference numbers are shown to be close to unit in the temperature range of 500–600 °С at the wet hydrogen-containing reducing atmosphere.

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.

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.

scholarly journals Oxygen surface exchange and diffusion in fast ionic conductors

1986 ◽  
Vol 18-19 ◽  
pp. 1038-1044 ◽  
Author(s):  
B STEELE ◽  
J KILNER ◽  
P DENNIS ◽  
A MCHALE ◽  
M VANHEMERT ◽  
...  
Keyword(s):  
Ionic Conductors ◽  
Surface Exchange ◽  
Fast Ionic Conductors ◽  
And Diffusion ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Oxygen surface exchange and diffusion studies of La2Mo2O9 in different exchange atmospheres

2011 ◽  
Vol 189 (1) ◽  
pp. 39-44 ◽  
Author(s):  
J. Liu ◽  
R.J. Chater ◽  
R.J.H. Morris ◽  
S.J. Skinner
Keyword(s):  
Surface Exchange ◽  
Diffusion Studies ◽  
And Diffusion ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

scholarly journals Tensile Lattice Strain Accelerates Oxygen Surface Exchange and Diffusion in La1–xSrxCoO3−δ Thin Films

ACS Nano ◽  
2013 ◽  
Vol 7 (4) ◽  
pp. 3276-3286 ◽  
Author(s):  
Markus Kubicek ◽  
Zhuhua Cai ◽  
Wen Ma ◽  
Bilge Yildiz ◽  
Herbert Hutter ◽  
...  
Keyword(s):  
Thin Films ◽  
Lattice Strain ◽  
Surface Exchange ◽  
And Diffusion ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface
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