Propriétés de transport dans les bronzes de tungstène substitués au tantale
- 26 March 1983
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine Part B
- Vol. 47 (3) , 315-322
- https://doi.org/10.1080/13642812.1983.9728503
Abstract
Transport properties of tungsten bronzes doped with tantalum The thermoelectric power of several Na x Ta y W 1−y O 3 , bronzes have been measured between 4.2 and 900 K. As the number of d electrons decreases, a metal-non-metal transition occurs, which is ascribed to Anderson localization. The transport properties of the non-metallic samples are described in terms of three different hopping mechanisms at the Fermi level. With rising temperature first variable-range hopping, then Miller–Abrahams and finally Heikes hopping successively prevail.Keywords
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