Combined homo-hetero doping for enhancement of ionic conductivity

Akila, R. ; Jacob, K. T. (1987) Combined homo-hetero doping for enhancement of ionic conductivity Solid State Ionics, 25 (2-3). pp. 217-221. ISSN 0167-2738

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Electrical conductivity of Na0.005Ca0.995F1.995 and Y0.008Ca0.992F2.008 samples containing 2 mol% CeO2−x as the dispersed phase has been measured in the range 630 to 1030 K using an ac bridge at 1 kHz. The presence of the dispersed phase enhanced the conductivity of CaF2 homogeneously doped with NaF. However, heterogeneous doping with CeO2−x decreased the conductivity of YF3-doped CaF2. This suggests that preferential adsorption of F− ions to the CeO2−x interface and the consequent creation of a space charge region with increased fluorine vacancies near the interface is the primary mechanism responsible for the enhancement of the conductivity of CaF2 heterogeneously doped with CeO2−x. By the synergetic effect of homogeneous and heterogeneous doping, the conductivity of polycrystalline CaF2 can be enhanced by 4.5 orders of magnitude at 630 K.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:94839
Deposited On:04 Oct 2012 10:30
Last Modified:04 Oct 2012 10:30

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