Thangadurai, V. ; Shukla, A. K. ; Gopalakrishnan, J. (1997) Oxide-ion conduction in anion-deficient double perovskites, Ba2BB'O5.5 (B=Li, Na; B'=Mo, W, Te) Solid State Ionics, 104 (3-4). pp. 277-283. ISSN 0167-2738
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S01672...
Related URL: http://dx.doi.org/10.1016/S0167-2738(97)00424-4
Abstract
We have investigated the oxide-ion conduction of anion-deficient double perovskites of the formula, Ba2BB'O5.5 (B=Li, Na; B'=Mo, W, Te), in relation to the parent oxides, Ba2BB'O6 (B=Ca). Powder XRD and 7Li/23Na MAS NMR spectra indicate that the oxygen vacancies are not ordered in the Ba2BB'O5.5 oxides. Anion-deficient oxides show appreciably higher conductivities than the parent stoichiometric oxides. The highest oxide-ion conductivity of ~10-2 S/cm at 700°C in this series is exhibited by Ba2NaMoO5.5. A smooth conductivity transition around 350°C as indicated by a discontinuity in the Arrhenius plots of the molybdenum compounds has been ascribed to a change-over from a two-dimensional to bulk (three-dimensional) oxygen vacancy migration in these oxides.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Perovskites; Oxide-ion Conductivity; Solid Oxide Fuel Cell |
| ID Code: | 12544 |
| Deposited On: | 13 Nov 2010 13:23 |
| Last Modified: | 17 Jul 2012 08:35 |
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