Transport processes and surface transformation at the CaWO4|WO3 interface

Elena Konisheva, Arkady Neiman, Elisaveta Gorbunova

Research output: Journal PublicationConference articlepeer-review

15 Citations (Scopus)

Abstract

The effect of WO3 activity (aWO3) in the surrounding gas phase on spontaneous processes at the CaWO4|WO3 interface was examined in experiments performed in a chamber open to the ambient air (i) and in a closed chamber (ii), where the samples were brought to an equilibrium with the WO3 vapor. The processes in both types of the chambers exhibited a bilateral behavior: spreading of WO3 into the CaWO4 ceramic and, simultaneously, penetration of CaWO4 components into the WO3 ceramic. The mass of the CaWO4 pellets was found to change to a significantly different degree. The conductivity of the CaWO4 ceramic increased with growing aWO3. The obtained results were discussed using a model of formation of the CW-s intermediate surface phase. When aWO3 increased, the CW-s film became thicker and the degree of the film continuity was enhanced.

Original languageEnglish
Pages (from-to)45-49
Number of pages5
JournalSolid State Ionics
Volume157
Issue number1-4
DOIs
Publication statusPublished - Feb 2003
Externally publishedYes
Event6th ISSFIT Conf. - Cracow, Poland
Duration: 9 May 200112 May 2001

Keywords

  • CaWO
  • Chemical compounds
  • Conductivity
  • Dispersion and spreading of solid oxides
  • Effect of a
  • Surface phenomena in solids
  • WO

ASJC Scopus subject areas

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

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