Semiconducting behavior in the liquid Ag-As2X3 system (X: Te, Se)

Takeshi Usuki, Keiji Itoh, Osamu Ueniura, Yasuo Kameda

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Measurements of the electrical conductivity, magnetic susceptibility and thermoelectric power have been carried out on liquid Ag-As2Te3 and Ag-As2Te3 systems. The liquid Ag-As2Te3 system exhibits a deep minimum of the electrical conductivity, diamagnetic peak of the magnetic susceptibility and rapid drop of the positive thermoelectric power at the stoichiometric composition of Ag6As2Te3, reflecting the occurrence of the metal-semiconductor transition. The liquid Ag6As2Te3 system also has the diamagnetic peak of magnetic susceptibility and sign reversion of thermoelectric power near the composition of Ag6As2Te3. However, the electrical conductivity in the selenide system indicates a negative temperature dependence like metals and takes a maximum value at this composition. The observed results have been discussed with the help of the pseudogap model developed by Enderby and Barnes. In this result, the unusual behavior of electrical conductivity in the selenide system has been deduced to be associated with the conduction and valence band edge-parameters rather than the pseudogap width.

Original languageEnglish
Pages (from-to)656-662
Number of pages7
JournalBerichte der Bunsengesellschaft/Physical Chemistry Chemical Physics
Volume102
Issue number4
Publication statusPublished - 1998
Externally publishedYes

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Keywords

  • Chemical bond
  • Electrical properties
  • Liquids
  • Metals
  • Semiconductors

ASJC Scopus subject areas

  • Chemical Engineering(all)

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