Interfacial effects on Ag:S nonstoichiometry in silver sulfide/alumina composites

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Abstract

The relative stoichiometry of Ag2S containing dispersions of 0.2 μm Al2O3 particles was measured as a function of the chemical potential of silver between 158 and 220°C using solid state coulometric titration. For composites consisting of 3.5 m2 of interface area per 1 cm3 of Al2O3Ag2S composite, the effective homogeneity range in comparison to the pure material was as much as 120 times greater for the low temperature phase (α-Ag2S) and 50% greater for the high temperature phase (β-Ag2S). The process was described as that of silver absorption at solid-solid interfaces. Absorption isotherms and partial molar quantities for the interface were determined at 158 and 200°C.

Original languageEnglish (US)
Pages (from-to)117-129
Number of pages13
JournalSolid State Ionics
Volume21
Issue number2
DOIs
StatePublished - Sep 1986

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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