Journal article
Influence of sintering profile on the microstructure and electronic transport properties of Sr(Ti,Nb)O3 tapes for solid oxide cell applications
Solid State Chemistry, Department of Energy Conversion and Storage, Technical University of Denmark1
Department of Energy Conversion and Storage, Technical University of Denmark2
Technical University of Denmark3
Administration, Department of Energy Conversion and Storage, Technical University of Denmark4
Electrochemical Materials, Department of Energy Conversion and Storage, Technical University of Denmark5
Nb-doped strontium titanate (Sr0.99Ti0.9Nb0.1O3, STN) tapes were fabricated by tape casting and used for investigating the influence of pre-treatment temperature on the sintering behavior, microstructure and electronic properties. The pre-treatment temperature was varied between 500 °C and 800 °C. Phase analysis of the powder from the pre-treatment step showed a single phase up to 700 °C and a Sr-enriched secondary phase beyond 700 °C.
Sintering dilatometry showed similar sintering behaviour with little variation in the final shrinkage with different pre-treatment temperatures. Backscattered electron imaging confirmed the presence of Sr enriched secondary phase for pre-treatment at 700 °C or above. Conductance mapping on samples pre-treated at 800 °C and sintered at 1450 °C exhibited regions of low conductance.
Conductivity measurements of pre-treated and sintered, at 1300 °C, samples showed decrease in conductivity within creasing pre-treatment temperature. These observations enhance the understanding of processing STN materials for solid oxide cells applications significantly.
| Language: | English |
|---|---|
| Year: | 2019 |
| Pages: | 164-169 |
| ISSN: | 18727689 and 01672738 |
| Types: | Journal article |
| DOI: | 10.1016/j.ssi.2019.01.030 |
| ORCIDs: | Sudireddy, B. R. , Agersted, K. , Hansen, K.V. and Mogensen, M. B. |
