Enhanced Oxide Ion Diffusion in the Interlanthanide Perovskite LaTmO3

1998 ◽  
Vol 527 ◽  
Author(s):  
M. Deepa ◽  
U.V. Varadaraju
Keyword(s):  
Ionic Conductivity ◽  
Single Phase ◽  
Lanthanum Gallate ◽  
Ion Diffusion ◽  
Ion Conductor ◽  
Similar Compound ◽  
Oxide Ion Conductivity ◽  
Oxygen Ion ◽  
Oxygen Ion Diffusion ◽  
Oxide Ion

ABSTRACTRecent studies on Perovskites type compounds revealed an oxide ion conductivity, higher than that of Fluorite structures. The most recent one is doped Lanthanum Gallate, which exhibits a maximum ionic conductivity of 0.14 S cm-1 and is a promising new ion conductor. The objective of this study is to synthesize and investigate the ionic conductivity of a similar compound, namely doped LaTmO3. Single phase compounds of the system La1-xSrxTm1-yMgyO3(X=0-0.2,y=0.1&0.2) were synthesized and the ionic conductivity measured at various temperatures. The results showed that ionic conductivity improved significantly with Sr doping. It showed highest oxygen ion diffusion and catalytic activity for Sr doped LaTmO3.

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.

scholarly journals The Effect of Co-Doping at the A-Site on the Structure and Oxide Ion Conductivity in (Ba0.5-xSrx)La0.5InO3-δ: A Molecular Dynamics Study

2019 ◽  
Author(s):  
Kuk-Jin Hwang ◽  
Hae-Jin Hwang ◽  
Myung-Hyund Lee ◽  
Seng-Min Jeong ◽  
Tae Ho Shin
Keyword(s):  
Molecular Dynamics ◽  
Ionic Conductivity ◽  
Dynamics Simulation ◽  
Perovskite Oxide ◽  
Ion Conductor ◽  
Co Doping ◽  
Oxide Ion Conductivity ◽  
Oxygen Ion ◽  
Oxygen Ion Conductor ◽  
A Site

The molecular dynamics simulation has been used to investigate the structural and transport properties of (Ba0.5-xSrx)La0.5InO3-δ (x=0, 0.1, 0.2) oxygen-ion conductor. The previous studies reported that the ionic conductivity of Ba-doped LaInO3 decreases because Ba dopant forms narrow oxygen path in the lattice, which could hinder the diffusion of oxygen ion. In this study, we reveal the mechanism to improve the ionic conductivity by Ba and Sr co-doping on La site in LaInO3 perovskite oxide. The results show that the ionic conductivity of (Ba0.5-xSrx)La0.5InO3-δ increases with increasing numbers of Sr ions, which oxygen diffusion paths including Sr ion have larger critical radius than Ba ions. The RDF calculations showed the heights of peak in composition including Sr ions is lower and broaden, so oxygen ions moved easily into other oxygen sites.

Influence of Fe Doping on the Oxygen-Ion Diffusion and Electrical Conduction of La1.95K0.05Mo2-XFexO9-δ

2010 ◽  
Vol 663-665 ◽  
pp. 506-510
Author(s):  
Chun Li ◽  
Da Li ◽  
Qian Feng Fang
Keyword(s):  
Phase Transition ◽  
Fe Doping ◽  
Conductivity Measurements ◽  
Ion Diffusion ◽  
Solid Reaction ◽  
Ion Conductor ◽  
Reaction Method ◽  
Oxygen Ion ◽  
Oxygen Ion Conductor ◽  
Oxygen Ion Diffusion

Based on the oxygen ion conductor La1.95K0.05Mo2O8.95, a series of Fe-doped samples La1.95K0.05Mo2-xFexO9- (x=0, 0.025, 0.05, 0.1) were prepared with conventional solid reaction method. The effects of Fe doping on the structure, oxygen ion diffusion and electrical conductivity were studied. Based on the results of conductivity measurements, it can be concluded that Fe doping can improve the conductivity obviously, and doping of both Fe and K samples have better conductivity, which successfully suppresses the phase transition.

Relaxation peaks associated with the oxygen-ion diffusion in La2−xBixMo2O9 oxide-ion conductors

2004 ◽  
Vol 370 (1-2) ◽  
pp. 365-369 ◽  
Author(s):  
Q.F. Fang ◽  
X.P. Wang ◽  
Z.S. Li ◽  
G.G. Zhang ◽  
Z.G. Yi
Keyword(s):  
Ion Diffusion ◽  
Oxygen Ion ◽  
Oxygen Ion Diffusion ◽  
Oxide Ion Conductors ◽  
Oxide Ion ◽  
Ion Conductors

scholarly journals Oxygen deficient layered double perovskite as an active cathode for CO2 electrolysis using a solid oxide conductor

2015 ◽  
Vol 182 ◽  
pp. 227-239 ◽  
Author(s):  
Tae Ho Shin ◽  
Jae-Ha Myung ◽  
Maarten Verbraeken ◽  
Guntae Kim ◽  
John T. S. Irvine
Keyword(s):  
Double Perovskite ◽  
Cathode Side ◽  
Layered Perovskite ◽  
Ion Diffusion ◽  
Oxide Electrode ◽  
Oxygen Ion ◽  
A Site ◽  
Oxygen Ion Diffusion ◽  
Co2 Electrolysis ◽  
A Current

A-site ordered PrBaMn2O5+δ was investigated as a potential cathode for CO2 electrolysis using a La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) electrolyte. The A-site ordered layered double perovskite, PrBaMn2O5+δ, was found to enhance electrocatalytic activity for CO2 reduction on the cathode side since it supports mixed valent transition metal cations such as Mn, which could provide high electrical conductivity and maintain a large oxygen vacancy content, contributing to fast oxygen ion diffusion. It was found that during the oxidation of the reduced PrBaMn2O5+δ (O5 phase) to PrBaMn2O6−δ (O6 phase), a reversible oxygen switchover in the lattice takes place. In addition, here the successful CO2 electrolysis was measured in LSGM electrolyte with this novel oxide electrode. It was found that this PrBaMn2O5+δ, layered perovskite cathode exhibits a performance with a current density of 0.85 A cm−2 at 1.5 V and 850 °C and the electrochemical properties were also evaluated by impedance spectroscopy.

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