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Spark plasma sintered YSZ gas electrode produced from powders synthesized by a large-scale method

Ghayoor, R ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matchemphys.2022.126467
  3. Publisher: Elsevier Ltd , 2022
  4. Abstract:
  5. Monitoring the oxygen in the fume and controlling its amount at high temperatures is an efficient way to regulate combustion efficiency. Zirconia can be an attractive candidate for use in oxygen sensors due to its good physical and chemical properties. The crystal structure of pure zirconia nanopowder due to the lack of cubic phase cannot be used for the fabrication of gas sensor electrodes. Moreover, the change of temperature during ceramic processing and application can promote structural and phase stresses. In this work, to achieve a pure cubic phase, yttria was successfully added to zirconia by a large-scale and effective method called Pechini. The yttria-stabilized zirconia nanopowders with a size of ∼27 nm have been transformed into dense and high-quality pellets in a spark plasma sintering (SPS) process. The results showed that the pellets obtained from this process have a pure phase structure and uniform morphology and their electrical conductivity is 0.11 × 10-2 S cm-1 at 700 °C which is higher than that of conventionally sintered pellets. © 2022 Elsevier B.V
  6. Keywords:
  7. Gas sensor ; SPS process ; Yttria-stabilized zirconia ; Crystal structure ; Electrodes ; Gas detectors ; Nanostructured materials ; Oxygen sensors ; Pelletizing ; Spark plasma sintering ; Yttrium oxide ; Cubic phase ; Gas electrodes ; Gas-sensors ; Large-scales ; Scale method ; Spark plasma ; Spark-plasma-sintering-process ; Synthesised ; Yttria-stabilized-zirconia ; Zirconia nanopowders ; Yttria stabilized zirconia
  8. Source: Materials Chemistry and Physics ; Volume 289 , 2022 ; 02540584 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0254058422007738