Dielectric relaxation studies of Bi-doping effects on the oxygen-ion diffusion in La2−xBixMo2O9 oxide-ion conductors

2002 ◽  
Vol 81 (18) ◽  
pp. 3434-3436 ◽  
Author(s):  
X. P. Wang ◽  
Q. F. Fang ◽  
Z. S. Li ◽  
G. G. Zhang ◽  
Z. G. Yi
Keyword(s):  
Dielectric Relaxation ◽  
Ion Diffusion ◽  
Oxygen Ion ◽  
Doping Effects ◽  
Bi Doping ◽  
Relaxation Studies ◽  
Oxygen Ion Diffusion ◽  
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.

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

Influence of Tungsten Doping in La2Mo2O9 Oxide-Ion Conductors by Dielectric Relaxation Measurements

2011 ◽  
Vol 130-134 ◽  
pp. 3302-3305
Author(s):  
Dan Li ◽  
Xiang Hu Li
Keyword(s):  
Phase Transition ◽  
Dielectric Relaxation ◽  
Ion Diffusion ◽  
Ion Distribution ◽  
Β Phase ◽  
Oxygen Ion ◽  
Relaxation Measurements ◽  
Temperature Relaxation ◽  
Oxygen Ion Diffusion ◽  
Tungsten Doping

The effects of tungsten doping in La2Mo2–yWyO9 (y =0, 0.25, 0.5, 1.0, 1.4) samples were studied using dielectric relaxation measurements. The results indicate that the solubility of W6+ in La2Mo2O9 sample is about 25mol%, W6+ can suppress the α/β phase transition in the La2Mo2O9. Additional to the low-temperature relaxation peak Pd associated with oxygen ion diffusion, a new dielectric loss peak Ph associated with a phase transition from the static disordered state to the dynamic disordered state of oxygen ion distribution was observed around 740 K. The conductivity of La2Mo1.9W0.1O9 sample is higher than that of the pure La2Mo2O9, and then decrease with the increasing of the tungsten doping in La2Mo2–yWyO9 (y = 0.5, 1.0) samples in the whole measurement temperature.

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