scholarly journals Role of structural defects and oxygen ion migration in the catalytic activity of La2O3

1993 ◽  
Vol 89 (20) ◽  
pp. 3833 ◽  
Author(s):  
Douglas J. Ilett ◽  
M. Saiful Islam
Keyword(s):  
Catalytic Activity ◽  
Structural Defects ◽  
Ion Migration ◽  
Oxygen Ion ◽  
Oxygen Ion Migration

Role of Oxygen Ion Migration in the Electrical Control of Magnetism in Pt/Co/Ni/HfO2 Films

2016 ◽  
Vol 120 (3) ◽  
pp. 1633-1639 ◽  
Author(s):  
Xiangjun Zhou ◽  
Yinuo Yan ◽  
Miao Jiang ◽  
Bin Cui ◽  
Feng Pan ◽  
...  
Keyword(s):  
Ion Migration ◽  
Electrical Control ◽  
Oxygen Ion ◽  
Oxygen Ion Migration

scholarly journals Fast oxygen ion migration in Cu–In–oxide bulk and its utilization for effective CO2 conversion at lower temperature

2021 ◽  
Author(s):  
Jun-Ichiro Makiura ◽  
Takuma Higo ◽  
Yutaro Kurosawa ◽  
Kota Murakami ◽  
Shuhei Ogo ◽  
...  
Keyword(s):  
Low Temperature ◽  
Water Gas Shift ◽  
Chemical Looping ◽  
Co2 Conversion ◽  
Ion Migration ◽  
Oxygen Ion ◽  
Reverse Water Gas Shift ◽  
Oxygen Ion Migration ◽  
Lower Temperature ◽  
Water Gas

Efficient activation of CO2 at low temperature was achieved by reverse water–gas shift via chemical looping (RWGS-CL) by virtue of fast oxygen ion migration in a Cu–In structured oxide, even at lower temperatures.

X-ray diffraction study of oxygen-conducting compoundsLn2Mo2O9(Ln= La, Pr)

2014 ◽  
Vol 70 (4) ◽  
pp. 669-675 ◽  
Author(s):  
Alexander M. Antipin ◽  
Olga A. Alekseeva ◽  
Natalia I. Sorokina ◽  
Alexandra N. Kuskova ◽  
Michail Yu. Presniakov ◽  
...  
Keyword(s):  
Room Temperature ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Ion Migration ◽  
Transmission Microscopy ◽  
Coordination Environment ◽  
X Ray ◽  
Oxygen Ions ◽  
Oxygen Ion ◽  
Oxygen Ion Migration

The La2Mo2O9(LM) and Pr2Mo2O9(PM) single crystals are studied using precision X-ray diffraction and high-resolution transmission microscopy at room temperature. The crystal structures are determined in the space groupP213. La and Pr atoms, as well as Mo1 and O1 atoms, are located in the vicinity of the threefold axes rather than on the axes as in the high-temperature cubic phase. In both structures studied, the O2 and O3 positions are partially occupied. The coexistence of different configurations of the Mo coordination environment facilitates the oxygen-ion migration in the structure. Based on the X-ray data, the activation energies of O atoms are calculated and the migration paths of oxygen ions in the structures are analysed. The conductivity of PM crystals is close to that of LM crystals. The O2 and O3 atoms are the main contributors to the ion conductivity of LM and PM.

YBa2Cu3O7–x:Transport Properties and Defects at High Temperature

1989 ◽  
Vol 44 (12) ◽  
pp. 1167-1171 ◽  
Author(s):  
G. Chiodelli ◽  
G. Campari-Viganò ◽  
G. Flor
Keyword(s):  
Electrical Resistivity ◽  
High Temperature ◽  
Tetragonal Phase ◽  
Orthorhombic Phase ◽  
Ion Migration ◽  
Resistivity Measurements ◽  
Oxygen Ion ◽  
Partial Pressures ◽  
Oxygen Ion Migration ◽  
The One

Abstract Electrical resistivity measurements were carried out on polycrystalline YBa2Cu3O7-x at temperatures 300 < T < 1023 K and oxygen partial pressures 5 ·10-7 ≤ po2 ≤ 1 atm. The samples, equilibrated in the range from 5 ·10-4 to 1 atm, show metallic behaviour, the one equilibrated at po2 = 2 ·10-5 shows a transition between metallic and semiconducting behaviour at 920 K, and that equilibrated at po2 = 5 ·10-7 shows semiconducting behaviour: for the latter the relevant resistivity is due to the oxygen-ion migration. The isotherms log σ vs. log po2 (in the temperature range from 723 to 1023 K) show slopes of about 1/6 at 723 K (orthorhombic phase) and about 1/2 at 1023 K (tetragonal phase). These results are discussed in terms of appropriate defect models.

scholarly journals Fast Oxygen Ion Migration in Cu–In–oxide Bulk and Its Utilization for Effective CO2 Conversion at Lower Temperature

2020 ◽  
Author(s):  
Takuma Higo ◽  
Jun-Ichiro Makiura ◽  
Yutaro Kurosawa ◽  
Kota Murakami ◽  
Shuhei Ogo ◽  
...  
Keyword(s):  
Water Gas Shift ◽  
Chemical Looping ◽  
Key Factors ◽  
Ion Migration ◽  
Oxygen Ion ◽  
Reverse Water Gas Shift ◽  
Oxygen Ion Migration ◽  
Lower Temperature ◽  
Water Gas ◽  
Oxide Ions

Efficient activation of CO<sub>2</sub> at low temperature was achieved by reverse water–gas shift <i>via</i> chemical looping (RWGS‑CL) by virtue of fast oxygen ion migration in Cu–In–structured oxide, even at lower temperatures. Results show that novel Cu–In<sub>2</sub>O<sub>3</sub> structured oxide can show a remarkably higher CO<sub>2</sub> splitting rate than ever reported. Various analyses revealed that RWGS‑CL on Cu–In<sub>2</sub>O<sub>3</sub> is derived from redox between Cu–In<sub>2</sub>O<sub>3</sub> and Cu<i><sub>x</sub></i>In<i><sub>y</sub></i> alloy. Key factors for high CO<sub>2</sub> splitting were fast migration of oxide ions in alloy and the preferential oxidation of the interface of alloy–In<sub>2</sub>O<sub>3</sub> in the bulk of the particles. The findings reported herein can open up new avenues to achieve effective CO<sub>2</sub> conversion at lower temperatures.

scholarly journals Dynamics of Anisotropic Oxygen-Ion Migration in Strained Cobaltites

Nano Letters ◽  
2021 ◽  
Author(s):  
Qinghua Zhang ◽  
Fanqi Meng ◽  
Ang Gao ◽  
Xinyan Li ◽  
Qiao Jin ◽  
...  
Keyword(s):  
Ion Migration ◽  
Oxygen Ion ◽  
Oxygen Ion Migration

scholarly journals Electronic Structures and Oxygen Ion Migration Energies of Metal Doped CeO2Systems：A DFT+U Study

2013 ◽  
Vol 71 (12) ◽  
pp. 1668 ◽  
Author(s):  
Guixiao Jia ◽  
Wenxing Hao ◽  
Fei Pan ◽  
Jichun Yang ◽  
Yongfan Zhang
Keyword(s):  
Electronic Structures ◽  
Ion Migration ◽  
Oxygen Ion ◽  
Oxygen Ion Migration ◽  
Metal Doped
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