Extremely high silver ionic conductivity in composites of silver halide (AgBr, AgI) and mesoporous alumina

Yamada, H. ; Bhattacharyya, A. J. ; Maier, J. (2006) Extremely high silver ionic conductivity in composites of silver halide (AgBr, AgI) and mesoporous alumina Advanced Functional Materials, 16 (4). pp. 525-530. ISSN 1616-301X

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/adfm.20...

Related URL: http://dx.doi.org/10.1002/adfm.200500538

Abstract

The silver ionic conductivity in heterogeneous systems of AgBr:Al2O3 and AgI:Al2O3 is highly enhanced by utilizing mesoporous Al2O3 as the insulating phase. The highest Ag+ conductivity of 3.1 × 10-3 Ω-1 cm-1 (at 25 °C) has been obtained for the AgI:Al2O3 composite with an Al2O3 volume fraction of 0.3. For AgBr:Al2O3, the enhancement of the conductivity is satisfactorily explained in the framework of the ideal space-charge model, while in the case of AgI:Al2O3 stacking disorder is also considered to contribute to the ionic conductivity.

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