Enhanced reactivity of domain walls in with sodium |
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Authors: | A Aird EKH Salje |
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Institution: | (1) Department of Earth Sciences and IRC in Superconductivity, University of Cambridge, Downing Street,Cambridge, CB2 3EQ, UK, GB |
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Abstract: | A possible new high temperature superconducting phase was recently reported in WO
3
:Na. We have examined the reaction between sodium vapour and WO
3
, and compared the phases formed by the reaction to previously known WO
3
phases. By using light microscopy and electron microprobe analysis, domain walls from the interior of the crystal are shown
to have a much higher Na content than bulk material after reaction with Na vapour. This indicates preferential transport along
the domain walls. The result is very similar to a reduction reaction of WO
3
crystals in which twin walls lose oxygen preferentially. Oxygen deficient twin walls are superconducting with .
Received 3 September 1999 and Received in final form 15 December 1999 |
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Keywords: | PACS 61 72 Mm Grain and twin boundaries - 66 30 -h Diffusion in solids - 81 70 Jb Chemical composition analysis chemical depth and dopant profiling |
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