Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9761731 | Solid State Ionics | 2005 | 5 Pages |
Abstract
The influence of potassium doping on the oxygen-ion diffusion and the ionic conduction in the La2Mo2O9 oxide-ion conductors has been systematically investigated via the dielectric and mechanical relaxation techniques and the dc conductivity measurements. Two relaxation peaks are observed in the K-doped samples. It is found that the partial substitution of K+ ions at La3+ sites increases the activation energy of oxygen ion diffusion, which can be understood because K+ ions have a larger ionic radius in the crystal lattice and a greater chemical affinity with oxygen ions in comparison with La3+ ions. Based on the results of conductivity measurements, it can be concluded that K doping can effectively suppress the phase transition and the highest conductivity at lower temperatures is obtained in the 2.5% K-doped La2Mo2O9 samples.
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Physical Sciences and Engineering
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Authors
X.P. Wang, Z.J. Cheng, Q.F. Fang,