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Findings from University of London Imperial College in the Area of Chalcogens Described (Oxygen Ion Diffusion and Surface Exchange Properties of the...

September 9, 2014



Findings from University of London Imperial College in the Area of Chalcogens Described (Oxygen Ion Diffusion and Surface Exchange Properties of the alpha- and delta-phases of Bi2O3)

By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Chalcogens. According to news reporting originating in London, United Kingdom, by NewsRx journalists, research stated, "Fast oxide ion conduction is a highly desirable property for materials in a wide range of applications. The fastest reported ionic conductor, representing the current state of the art and an oft-proposed effective limit of oxide ion conductivity, is the high temperature fluorite-structured delta phase of Bi2O3."

The news reporters obtained a quote from the research from the University of London Imperial College, "Here, the ionic nature of this conduction is, for the first time, directly determined through oxygen tracer diffusion measurements. This phase also presents a remarkably high oxygen surface exchange coefficient, competitive with the highest performance solid oxide fuel cell (SOFC) cathodes yet counterintuitively in a material with negligible electronic conduction. The low temperature alpha-Bi2O3 polymorph is also investigated, revealing a remarkable drop in diffusivity of over 7 orders of magnitude with a temperature drop of just approximate to 150 degrees C. Surprisingly, the diffusion studies also reveal a secondary, significantly faster migration pathway in the alpha phase. This is attributed to grain boundary conduction and shown to be 3-4 orders of magnitude higher than in the bulk."

According to the news reporters, the research concluded: "This previously unobserved property could present an exciting opportunity to tailor ionic conductivity levels through manipulating microstructure down to the nanoscale."

For more information on this research see: Oxygen Ion Diffusion and Surface Exchange Properties of the alpha- and delta-phases of Bi2O3. Advanced Energy Materials, 2014;4(10):24-29. Advanced Energy Materials can be contacted at: Wiley-V C H Verlag Gmbh, Boschstrasse 12, D-69469 Weinheim, Germany. (Wiley-Blackwell - www.wiley.com/; Advanced Energy Materials - onlinelibrary.wiley.com/journal/10.1002/(ISSN)1614-6840)

Our news correspondents report that additional information may be obtained by contacting R.D. Bayliss, University of London Imperial College, Dept. of Mat, London SW7 2AZ, United Kingdom. Additional authors for this research include S.N. Cook, S. Kotsantonis, R.J. Chater and J.A. Kilner (see also Chalcogens).

Keywords for this news article include: London, United Kingdom, Europe, Chalcogens

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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