Role of Water Vapor in Crystallite Growth and Tetragonal‐Monoclinic Phase Transformation of ZrO2
- 1 March 1983
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 66 (3) , 196-200
- https://doi.org/10.1111/j.1151-2916.1983.tb10016.x
Abstract
The role of water vapor in crystallite growth and the tetragonal‐to‐monoclinic phase transformation of ZrO2 was studied using three specially prepared samples: an ultrafine powder of monoclinic ZrO2 obtained by hydrolysis of ZrOCI2, an aggregated powder of tetragonal ZrO2 obtained by thermal decomposition of Zr(OH)4 under reduced pressure, and an ultrafine powder of tetragonal ZrO2 obtained by thermal decomposition of zirconyl acetate dispersed in caramel. The samples were heat‐treated up to 1000°C in dry and wet atmospheres saturated with water vapor at 90°C. It was found that water vapor markedly accelerated crystallite growth for both monoclinic and tetragonal ZrO2 and facilitated the tetragonal‐to‐monoclinic phase transformation. Water vapor increases surface diffusion and thus enhances crystallite growth and decreases surface energy, which leads to stabilization of the tetragonal phase.Keywords
This publication has 10 references indexed in Scilit:
- Agglomerate and Particle Size Effects on Sintering Yttria‐Stabilized ZirconiaJournal of the American Ceramic Society, 1981
- Thermal changes in texture of aggregates of ultra-fine crystallites in hydrolysed zirconia particlesJournal of Crystal Growth, 1980
- Characteristics and sintering behaviour of zirconia ultrafine powdersCeramurgia International, 1979
- Stabilization of the tetragonal structure in zirconia microcrystalsThe Journal of Physical Chemistry, 1978
- ZrO2 powders produced by vapor phase reactionCeramurgia International, 1977
- Characterization and Stabilization of Metastable Tetragonal ZrO2Journal of the American Ceramic Society, 1974
- Crystallization and Phase Transformation of Low Temperature Form Zirconia Prepared from Different Starting MaterialsNIPPON KAGAKU KAISHI, 1972
- Metastable Transitions of Zirconium Oxide Obtained from Decomposition of AlkoxidesJournal of the American Ceramic Society, 1966
- Preparation of Ultra‐High‐Purity Submicron Refractory OxidesJournal of the American Ceramic Society, 1965
- The Occurrence of Metastable Tetragonal Zirconia as a Crystallite Size EffectThe Journal of Physical Chemistry, 1965