Ionic conductivity and dielectric relaxation in Y doped La2Mo2O9 oxide-ion conductors

2014 ◽  
Vol 116 (14) ◽  
pp. 144102 ◽  
Author(s):  
T. Paul ◽  
A. Ghosh
Keyword(s):  
Ionic Conductivity ◽  
Dielectric Relaxation ◽  
Oxide Ion Conductors ◽  
Oxide Ion ◽  
Ion Conductors

Dielectric Relaxation Measurements in La1.94Ba0.06Mo2-yWyO9-δ (y=0, 1.0) Oxide-Ion Conductors

2014 ◽  
Vol 662 ◽  
pp. 20-23
Author(s):  
Dan Li ◽  
Bo Wang ◽  
Pei Gong ◽  
Jie Li ◽  
Xiang Hu Li
Keyword(s):  
Phase Transition ◽  
Dielectric Relaxation ◽  
Transition Process ◽  
Ion Diffusion ◽  
Oxygen Ion ◽  
Phase Transition Process ◽  
Relaxation Measurements ◽  
Oxide Ion Conductors ◽  
Oxide Ion ◽  
Ion Conductors

The influence of barium doping on the oxygen-ion diffusion and phase transition in the La2Mo2-yWyO9-δ (y=0, 1.0) oxide-ion conductors has been systematically investigated via dielectric techniques. In the Ba-doped La2Mo2O9 samples there are only two dielectric relaxation peaks Pd1 and Pd2, which are associated with the short-distance diffusion of oxygen vacancies. But in the Ba-doped La2MoWO9 members, three peaks are detected, including peak Pd1, Pd2, and peak Ph. The last is associated with the phase transition process from the static disordered state to the dynamic disordered state of oxygen ion/vacancy distribution.

New Oxide-Ion Conductors Ln2+xTi2-xO7-x/2 (Ln = Dy – Lu; x=0.096)

2006 ◽  
Vol 514-516 ◽  
pp. 422-426 ◽  
Author(s):  
Anna V. Shlyakhtina ◽  
João Carlos de Castro Abrantes ◽  
Alexey V. Levchenko ◽  
Sergei Yu. Stefanovich ◽  
Alexandr V. Knot'ko ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Thermal Annealing ◽  
Pyrochlore Structure ◽  
Temperature Range ◽  
Cation And Anion Sublattices ◽  
Oxide Ion Conductors ◽  
Oxide Ion ◽  
Anion Sublattices ◽  
Ion Conductors

New oxide-ion conductors Ln2+xTi2-xO7-x/2 (Ln = Dy-Lu, x = 0.096; 35.5 mol. % Ln2O3· 64.5 mol.% TiO2)-LANTIOX with a disordered pyrochlore structure are obtained by coprecipitation with next thermal annealing at 1600°C. Their ionic conductivity in air at 740°C attains 5·10-3 S/cm for Ln2.096Ti1.904O6.952 (Ln= Lu, Yb), 10-3 S/cm for Ln2,096Ti1,904O6,952 (Ln=Tm, Er, Ho) and 10- 4S/cm for Dy2,096Ti1,904O6,952 due to the presence of defects in both the cation and anion sublattices. The materials contain ~4.8-10.6% LnTi anti-site defects. Ln2.096Ti1.904O6.952 ceramics are shown to be stable in the temperature range of 1400 to 1700°C. 1400°C-samples Ln2+xTi2-xO7-x/2 have lower ionic conductivity then 1600°C and 1690°C samples.

Ionic Conductivities and Phase Transition of La2Mo2-xAlxO9-δ

2012 ◽  
Vol 160 ◽  
pp. 391-394
Author(s):  
Xiang Hu Li ◽  
Dan Li
Keyword(s):  
Phase Transition ◽  
Dielectric Relaxation ◽  
Ionic Conductivities ◽  
Aluminum Doping ◽  
Β Phase ◽  
Relaxation Measurements ◽  
Oxide Ion Conductors ◽  
Oxide Ion ◽  
Ion Conductors

The influence of aluminum doping on the ionic conductivities and phase transition in the La2Mo2–xAlxO9-δ(x = 0.1, 0.2, 0.3) oxide-ion conductors has been investigated by XRD, DSC and dielectric relaxation measurements. The results indicate that the solubility of Al3+ in La2Mo2O9 sample is about 10mol%, Al3+ can not suppress the α/β phase transition in the La2Mo2O9, and the aluminum substituted La2Mo2O9 has a higher conductivity in whole temperature than that of pure La2Mo2O9.

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