Prolonged flash sintering and its effects on defect chemistry, phase transformation and ionic conductivity of yttria-stabilized zirconia

Flash sintering is a beneficial technique for the preparation of ceramic materials with high sintering temperature. However, due to its technical and scientific challenges, it still requires more research to be completely discovered. In this study, prolonged flash sintering is performed on 8% mol. y...

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Published in:Applied physics. A, Materials science & processing Materials science & processing, 2022-09, Vol.128 (9), Article 804
Main Authors: Mohammad Alizadeh, Siavash, Mirkazemi, Seyed Mohammad, Mohebbi, Hamed
Format: Article
Language:English
Subjects:
Applied physics
Characterization and Evaluation of Materials
Condensed Matter Physics
Crystal defects
Crystal structure
Densification
Flash point
Grain boundaries
Ion currents
Machines
Manufacturing
Materials science
Nanotechnology
Optical and Electronic Materials
Oxygen
Phase transitions
Physics
Physics and Astronomy
Processes
Raman spectroscopy
Resistance sintering
Sintering
Space charge
Surfaces and Interfaces
Thin Films
Vacancies
Yttria-stabilized zirconia
Yttrium oxide
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Summary:Flash sintering is a beneficial technique for the preparation of ceramic materials with high sintering temperature. However, due to its technical and scientific challenges, it still requires more research to be completely discovered. In this study, prolonged flash sintering is performed on 8% mol. yttria-stabilized zirconia (8YSZ) from 1 to 60 min to investigate the effects of holding time on its properties. Results show that sample densification occurs almost at the flash point, and increasing the holding time does not affect the density. The results of X-ray diffraction and Raman spectroscopy show a phase transformation from cubic to tetragonal crystal structure after 30 min of holding time. The total ionic conductivities (at 800 °C) increase from 0.061 to 0.82 S/cm by extending the holding time from 1 to 30 min and afterwards decreases to 0.063 S/cm by 60 min of holding time. By calculating oxygen vacancy concentration at the space charge layer, it was revealed that oxygen vacancies are generated at both grain and grain boundaries during flash sintering.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-022-05967-2