Electrochemical excitation method in kinetic study of Ag2S

Shengping Ding, William Petuskey

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Abstract

A steady-state electrochemical method of sinusoidal excitation has been developed in which the chemical diffusion coefficient of an atomic species in a solid is obtained via the determination of the spatial distribution of the phase and amplitude of its chemical potential oscillation. It has been applied to Ag2+δS to measure the chemical diffusion coefficient D̃ of Ag in α-Ag2+δS at 168°C and in β-Ag2+δS at 220°C, with a typical precision of 0.2%. The measurements were performed at frequencies from 0.02 to 0.16 Hz, with δ covering the whole nonstoichiometry range. The values of D̃ measured fell between 0.01 and 0.15 cm2/s at 168°C and between 0.08 and 0.32 cm2/s at 220°C, changing significantly with f but slightly with f. The component diffusion coefficient of Ag+ was determined for β-Ag2+δS to be in the range of 3.0 to 3.6×10-5cm2/s, decreasing with a frequency dependence with increasing δ.

Original languageEnglish (US)
Pages (from-to)123-132
Number of pages10
JournalSolid State Ionics
Volume58
Issue number1-2
DOIs
StatePublished - Nov 1992

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ASJC Scopus subject areas

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

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