Hydrothermal Crystallization and Crystal Growth of Un-doped and ZrO2 -doped CeO2
The crystallization of un-doped and ZrO2-doped CeO2 was studied from the precipitated hydrous ceria with KF, LiCl, LiBr, K2CO3, LiNO3, Li2S04 and NaOH solutions under 100 MPa at 500 to 600°C for 24 h. The KF and Li2SO4 solutions enhanced effectively the growth of the crystallite of un-doped CeO2. The LiCl, LiBr and Li2SO4 solutions, whereas, enhanced the growth of the crystallite of ZrO2-doped CeO2. The calcination of the precipitated hydrous ceria contributed to the hydrothermal growth of the crystallite of ZrO2-doped CeO2 with LiCl solution. The single crystals of un-doped CeO2 (120µm) and ZrO2-doped CeO2 (200µm) were obtained by the hydrothermal treatments with KF and LiCl solutions, respectively.
KeywordsHydrothermal Treatment Hydrothermal Condition Hydrothermal Growth LiCl Solution Hydrothermal Crystallization
Unable to display preview. Download preview PDF.
- 1).S. F. Pal’guev and Z. S. Volchenkova: Russ. J. Phys. Checm., 34 (1960) 211.Google Scholar
- 3).E. Tani, M. Yoshimura and S. Sōmiya: Yogyo Kyokai Shi, 90 (1982) 195.Google Scholar
- 5).E. Tani, M. Yoshimura and S. Sōmiya: J. Am. Ceram. Soc., 66 , in press (1983).Google Scholar
- 6).A. Rouanet: C. R. Acad. Sci., Paris 266C (1968) 908.Google Scholar