Single crystals of lanthanum cobaltite are prepared using a PbO/PbF₂ flux technique. Their electrical properties are investigated between 20 and 800 K. The thermal variations of Seebeck coefficient and electrical conductivity are explained taking into account lead doping of single crystals due to the preparation technique. Three different conduction mechanisms, succesively prevailing at rising temperature, are discussed.

Abstract

Des monocristaux de cobaltite de lanthane ont été préparés par méthode de flux (PbO/PbF₂). Leurs propriétés électriques ont été explorées entre 20 et 800 K. Les évolutions, en fonction de la température, du pouvoir thermoélectrique et de la conductivité électrique, sont analysées en tenant compte de la présence d'impuretés (plomb) inhérente à la méthode de synthèse. Trois mécanismes de conduction successivement prépondérants à température croissante sont discutés.

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Volume93, Issue1

16 January 1986

Pages 321-328

Electrical Properties of Lead-Doped LaCoO₃ Single Crystals

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Electrical Properties of Lead-Doped LaCoO3 Single Crystals

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Electrical Properties of Lead-Doped LaCoO₃ Single Crystals