Oxide ion conductivity of the new Aurivillius phase (Bi2O2) (NaNb2O6.5)

A new Aurivillius phase, (Bi2O2)(NaNb2O6.5), with intrinsic oxygen vacancies has been synthesized. The average structure is very close to that of the parent phase (Bi2O2)(CaNb2O7). The new phase displays a discontinuous change in the Arrhenius plot of the ionic conductivity versus temperature. Diffe...

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Bibliographic Details
Published in:Solid state ionics 1994-09, Vol.72, p.309-313
Main Authors: Pham, A.-Q., Puri, M., DiCarlo, J.F., Jacobson, A.J.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Diffusion in solids
Exact sciences and technology
Physics
Self-diffusion and ionic conduction in nonmetals
Transport properties of condensed matter (nonelectronic)
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Summary:A new Aurivillius phase, (Bi2O2)(NaNb2O6.5), with intrinsic oxygen vacancies has been synthesized. The average structure is very close to that of the parent phase (Bi2O2)(CaNb2O7). The new phase displays a discontinuous change in the Arrhenius plot of the ionic conductivity versus temperature. Differential thermal analysis (DTA) confirmed the presence of a reversible phase transition at 860°C. At 900°C, the conductivity of (Bi2O2)(NaNb2O6.5) is 10−2S cm−1. At 1000°C, the Aurivillius phas e slowly decomposes to a mixture of phases with a lower total conductivity.
ISSN:0167-2738
1872-7689
DOI:10.1016/0167-2738(94)90165-1