Ionic Conductivity, Structure and Oxide Ion Migration Pathway in Fluorite-Based Bi8La10O27

2009 ◽  
Vol 21 (19) ◽  
pp. 4661-4668 ◽  
Author(s):  
Yuandi Li ◽  
Tom P. Hutchinson ◽  
Xiaojun Kuang ◽  
Peter R. Slater ◽  
Mark R. Johnson ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Ion Migration ◽  
Migration Pathway ◽  
Conductivity Structure ◽  
Oxide Ion

ChemInform Abstract: Ionic Conductivity, Structure and Oxide Ion Migration Pathway in Fluorite-Based Bi8La10O27.

ChemInform ◽  
2010 ◽  
Vol 41 (2) ◽  
Author(s):  
Yuandi Li ◽  
Tom P. Hutchinson ◽  
Xiaojun Kuang ◽  
Peter R. Slater ◽  
Mark R. Johnson ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Ion Migration ◽  
Migration Pathway ◽  
Conductivity Structure ◽  
Oxide Ion

The Crystal Structure of α-La2Mo2O9and the Structural Origin of the Oxide Ion Migration Pathway

2005 ◽  
Vol 17 (16) ◽  
pp. 4074-4077 ◽  
Author(s):  
Ivana Radosavljevic Evans ◽  
Judith A. K. Howard ◽  
John S. O. Evans
Keyword(s):  
Crystal Structure ◽  
Ion Migration ◽  
Migration Pathway ◽  
Oxide Ion

scholarly journals The Crystal Structure of α-La2Mo2O9 and the Structural Origin of the Oxide Ion Migration Pathway.

ChemInform ◽  
2005 ◽  
Vol 36 (43) ◽  
Author(s):  
Ivana Radosavljevic Evans ◽  
Judith A. K. Howard ◽  
John S. O. Evans
Keyword(s):  
Crystal Structure ◽  
Ion Migration ◽  
Migration Pathway ◽  
Oxide Ion

scholarly journals Highest Ionic Conductivity of BIMEVOX (ME = 10% Cu, 10% Ga, 20% Ta): Computational Modeling and Simulation

2020 ◽  
Vol 20 (3) ◽  
pp. 510
Author(s):  
Akram La Kilo ◽  
Alberto Costanzo ◽  
Daniele Mazza ◽  
Muhamad Abdulkadir Martoprawiro ◽  
Bambang Prijamboedi ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Dynamics Simulation ◽  
Partial Substitution ◽  
Equatorial Position ◽  
Ion Migration ◽  
Calculated Concentration ◽  
Defect Simulation ◽  
Computational Modeling And Simulation ◽  
Oxide Ion ◽  
Good Agreement

BIMEVOX had the potential to play an important role in solid oxide fuel cell, especially as the electrolyte due to their high ionic conductivity. In this work, oxide ion migrations of γ-Bi2VO5.5 and BIMEVOX were simulated using density function theory (DFT), Mott-Littleton method, and molecular dynamic simulation. In γ-Bi2VO5.5, there were oxygen vacancies at the equatorial position in the vanadate layers. These vacancies could facilitate oxide ions migration. The Enthalpy of the oxide migration for γ-Bi2VO5.5 based on DFT calculation was 0.38 eV, which was in a good agreement with experimental results. The γ-Bi2VO5.5 can be stabilized by partial substitution of V5+ with Cu2+, Ga3+, and Ta5+. Defect simulation results using the Mott-Littleton method showed that the total maximum energies of region II were achieved at concentrations of 10, 10, and 20%, respectively for Cu2+, Ga3+, and Ta5+. The calculated concentration of Cu2+, Ga3+, and Ta5+ were in a good agreement with those of experiment results, where the highest ionic conductivity obtained. The results of the molecular dynamics simulation showed that the activation energies of oxide ion migration in γ-Bi2VO5.5 and BIMEVOX (ME = Cu and Ta) respectively were 0.19, 0.21, and 0.10 eV, close to experimental values.

Ionic Conductivity Study on the New High Oxide Conducting Perovskite LaGaO3

1998 ◽  
Vol 527 ◽  
Author(s):  
G.V.M. Kiruthika ◽  
U.V. Varadaraju
Keyword(s):  
Activation Energy ◽  
Ionic Conductivity ◽  
Single Phase ◽  
Ion Conductivity ◽  
Lanthanum Gallate ◽  
Migration Energy ◽  
Ion Migration ◽  
Oxide Ion Conductivity ◽  
Unit Cell Size ◽  
Oxide Ion

ABSTRACTOxide ion conductivity studies have been done on the Lanthanum Gallate based compounds. Yttrium substitution at the Ga site has been attempted to increase the unit cell size. Single phase was obtained for limited Y substituion i.e., La0.9Sr0.1Ga0.7Y0.1Mg0.2O3-x. It is found that the activation energy for the oxide ion conductivity has decreased for this composition. Based on the tolerance factor and B-site radius values, the migration energies were obtained for the LaGaO3 based perovskites. It is observed that migration energy has been significantly reduced upon substitution at the B-site. Absence of an enhancement in the conductivity with Yttrium substitution could be due to the vaccancy ordering inhibiting the oxide ion migration.

Electronic/Ionic Conductivity and Oxygen Diffusion Coefficient af the Sr-Fe-Co-O System

1995 ◽  
Vol 393 ◽  
Author(s):  
B. Ma ◽  
J.-H. Park ◽  
C. U. Segre ◽  
U. Balachandran
Keyword(s):  
Diffusion Coefficient ◽  
Ionic Conductivity ◽  
Oxygen Diffusion ◽  
Ionic Conductivities ◽  
Transference Number ◽  
Transference Numbers ◽  
Oxygen Diffusion Coefficient ◽  
Ionic Transference Number ◽  
Local Fitting ◽  
Oxide Ion

ABSTRACTOxides in the Sr-Fe-Co-O system exhibit both electronic and ionic conductivities. Recently, the Sr-Fe-Co-O system attracted great attention because of its potential to be used for oxygen-permeable membranes that can operate without electrodes or external electrical circuitry. Electronic and ionic conductivities of two compositions of the Sr-Fe-Co-O system, named SFC-1 and SFC-2, have been measured at various temperatures. The electronic transference number is much greater than the ionic transference number in SFC-1, whereas the electronic and ionic transference numbers are very similar in SFC-2. At 800°C, the electronic and ionic conductivities are ≈76 and ≈4 S•cm−1, respectively, for SFC-1; whereas, for SFC-2, the electronic and ionic conductivities are ≈10 and ∼1 S•cm−1, respectively. By performing a local fitting to the equation σ • T = Aexp(-Ea / kT), we found that the oxide ion activation energies are 0.92 and 0.37 eV, respectively, for SFC-1 and SFC-2. The oxygen diffusion coefficient of SFC-2 is ≈ 9 x 10−7cm2/sec at 900°C.

scholarly journals The relationship between oxide-ion conductivity and cation vacancy order in the hybrid hexagonal perovskite Ba3VWO8.5

2020 ◽  
Vol 8 (32) ◽  
pp. 16506-16514 ◽  
Author(s):  
Asma Gilane ◽  
Sacha Fop ◽  
Falak Sher ◽  
Ronald I. Smith ◽  
Abbie C. Mclaughlin
Keyword(s):  
Ionic Conductivity ◽  
Long Range ◽  
Cation Vacancy ◽  
Ion Conductivity ◽  
Cation Ordering ◽  
Oxygen Diffusivity ◽  
Oxide Ion Conductivity ◽  
The Relationship ◽  
Oxide Ion

Cation ordering in Ba3VWO8.5 disrupts long-range oxygen diffusivity parallel to the c-axis resulting in reduced ionic conductivity.

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