TRANSITION OF ELECTRONIC CONDUCTION INTO IONIC CONDUCTION AS RELATED TO THE COMPOSITION OF SOLID OXIDE SOLUTIONS (in Russian)
Journal Article
·
· Doklady Akad. Nauk S.S.S.R.
OSTI ID:4115207
The influence of calcium oxide on the electro-conductivity of mixed oxides (Ce, Zr/O/sub 2/) was studied, and the character of conductivity was determined for several specimens, (0.75 CeO/sub 2/ - 0.25 ZrO/sub 2/) + CaO at 500 to 1000 deg C. The composition 0.75 CeO/sub 2/ - 0.25 ZrO/sub 2/ was considered as a single component with known maximum conductivity. The tests show that with small admixtures of calcium oxide, the ionic conductivity increases but the general conductivity decreases. Calcium oxide additions to zirconium dioxide and cerium dioxide separately induce an increase only in the general conductivity. Moreover, the higher the content of CaO in solid solutions, the larger the ionic conductivity. In the triple solution CeO/sub 2/-ZrO/sub 2/-CaO, oxygen ions are carriers of the ionic conductivity component. The electronic conductivity in solid solutions of CeO/sub 2/-ZrO/sub 2/ appears with the partial reduction of Ce/ sup 4+/ to Ce/sup 3+/. Measurements on solid electrolytes in contact with gases with high partial oxygen pressures (1.0 to 0.2 atm) show that with 20 to 40 mole% CaO the ionic conductivity is approximately -100%, while with small oxygen pressure (10/sup -7/ to 10/sup -25/ atm) electronic conductivity prevails. The ionic conductivity in the examined material reaches a maximum at 750 deg C. (R.V.J.)
- Research Organization:
- Inst. of Electrochemistry, Ural Branch, Academy of Sciences, USSR
- NSA Number:
- NSA-15-007334
- OSTI ID:
- 4115207
- Journal Information:
- Doklady Akad. Nauk S.S.S.R., Journal Name: Doklady Akad. Nauk S.S.S.R. Vol. Vol: 134
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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