Electrical conductivity and thermopower of Na_xTa_yW_1−yO₃ bronzes

J. P. Doumerc Laboratoire de Chimie du Solide du C.N.R.S., Université de Bordeaux I, 351 cours de la Libération, 33405, Talence, Cedex, France

P. Dordor Laboratoire de Chimie du Solide du C.N.R.S., Université de Bordeaux I, 351 cours de la Libération, 33405, Talence, Cedex, France

E. Marquestaut Laboratoire de Chimie du Solide du C.N.R.S., Université de Bordeaux I, 351 cours de la Libération, 33405, Talence, Cedex, France

M. Pouchard Laboratoire de Chimie du Solide du C.N.R.S., Université de Bordeaux I, 351 cours de la Libération, 33405, Talence, Cedex, France

P. Hagenmuller Laboratoire de Chimie du Solide du C.N.R.S., Université de Bordeaux I, 351 cours de la Libération, 33405, Talence, Cedex, France

Abstract

The electrical conductivity and thermoelectric power of several Na_xTa_yW_1–yO₃ bronzes have been measured between liquid-helium and room temperatures. As x–y decreases, a metal–non-metal transition occurs, which is ascribed to Anderson localization.

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Electrical conductivity and thermopower of Na_xTa_yW_1−yO₃ bronzes

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Electrical conductivity and thermopower of Na_xTa_yW_1−yO₃ bronzes