Transport processes and surface transformation at the CaWO4|WO3 interface

Elena Konisheva; Arkady Neiman; Elisaveta Gorbunova

doi:10.1016/S0167-2738(02)00188-1

Transport processes and surface transformation at the CaWO₄|WO₃ interface

Elena Konisheva, Arkady Neiman, Elisaveta Gorbunova

Research output: Journal Publication › Conference article › peer-review

15 Citations (Scopus)

Abstract

The effect of WO₃ activity (a_WO3) 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 a_WO3. The obtained results were discussed using a model of formation of the CW-s intermediate surface phase. When a_WO3 increased, the CW-s film became thicker and the degree of the film continuity was enhanced.

Original language	English
Pages (from-to)	45-49
Number of pages	5
Journal	Solid State Ionics
Volume	157
Issue number	1-4
DOIs	https://doi.org/10.1016/S0167-2738(02)00188-1
Publication status	Published - Feb 2003
Externally published	Yes
Event	6th ISSFIT Conf. - Cracow, Poland Duration: 9 May 2001 → 12 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

General Chemistry
General Materials Science
Condensed Matter Physics

Access to Document

10.1016/S0167-2738(02)00188-1

Cite this

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title = "Transport processes and surface transformation at the CaWO4|WO3 interface",

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.",

keywords = "CaWO, Chemical compounds, Conductivity, Dispersion and spreading of solid oxides, Effect of a, Surface phenomena in solids, WO",

author = "Elena Konisheva and Arkady Neiman and Elisaveta Gorbunova",

note = "Funding Information: One of the authors (E.K.) is deeply indebted to the Russian Federal Program “Integration” for a travel grant. This work was supported by the RFBR (Grant No. 01-03-33160), the Russian Federal Program «Universities of Russia—Fundamental Researches (No. UR 06.01.022)», and the CRDF (No. REC-005).; 6th ISSFIT Conf. ; Conference date: 09-05-2001 Through 12-05-2001",

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AU - Konisheva, Elena

AU - Neiman, Arkady

AU - Gorbunova, Elisaveta

N1 - Funding Information: One of the authors (E.K.) is deeply indebted to the Russian Federal Program “Integration” for a travel grant. This work was supported by the RFBR (Grant No. 01-03-33160), the Russian Federal Program «Universities of Russia—Fundamental Researches (No. UR 06.01.022)», and the CRDF (No. REC-005).

PY - 2003/2

Y1 - 2003/2

N2 - 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.

AB - 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.

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KW - Chemical compounds

KW - Conductivity

KW - Dispersion and spreading of solid oxides

KW - Effect of a

KW - Surface phenomena in solids

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