1. Raman and X-ray photoelectron spectroscopic characterizations of thermal stability of 3 mol% yttria stabilized zirconia ceramics.
- Author
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Zhu, Wenliang, Nakashima, Shizuka, Matsuura, Moeka, Gu, Hui, Marin, Elia, and Pezzotti, Giuseppe
- Subjects
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YTTRIA stabilized zirconium oxide , *THERMAL stability , *X-ray photoelectron spectroscopy , *TEMPERATURE effect , *POLYMORPHIC transformations , *HYDROXYLATION - Abstract
Structural variations and phase stability in 3 mol% yttria stabilized tetragonal zirconia (3Y-TZP) subjected to long-term aging at room temperature and thermal treatments in air were investigated by Raman and X-ray photoelectron spectroscopies, and compared with previous cases obtained by hydrothermal treatments. The results revealed a significant difference in the kinetics of zirconia polymorphic transformation in different environments due to the critical roles played by surface and lattice hydroxyl defects. Thermal treatments in air of long-term stored 3Y-TZP revealed a gradual recovery to tetragonal phase due to the ocurrence of dehydroxylation, while thermal treatments of pristine 3Y-TZP caused tetragonal-to-monoclinic polymorphic transformation at low temperature, but then an inverse transformation at higher tempertures due to a competition of hydroxylation and dehydroxylation. Treatments of 3Y-TZP in different environments were found to lead to distinct paths of off-stoichiometric chemistry, including hydroxylation, hydroxyl migration, surface reconstruction, and dehydroxylation during the treatments. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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