Microscopic inhomogeneity in sodium tungsten bronze: A comment

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Abstract
In a recent paper dealing with the electronic transport properties of the alkali-tungsten bronzes, Webman Jortner, and Cohen have sought to explain many of the observed properties of the tungsten bronzes by assuming strong clustering of the alkali components in the alloys, so that charge transport can be described by a classical percolation theory. This comment points out that many results from experiments in sodium tungsten bronze are inconsistent with this microscopic model.