Raman Spectroscopic Studies on the Formation Mechanism of Hydrous-Zirconia Fine Particles |
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| Authors: | Koji Matsui Hajime Suzuki Michiharu Ohgai Haruo Arashi |
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| Affiliation: | Nanyo Research Laboratory, Tosoh Corporation, Yamaguchi 746, Japan;Faculty of Engineering, Tohoku University, Sendai 980, Japan |
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| Abstract: | The Raman spectra of hydrous-zirconia fine particles produced by the hydrolysis of various ZrOCl2 solutions were investigated. The Raman spectra of hydrous zirconia synthesized at HCl concentrations below 1 mol/L were similar to those of monoclinic, crystalline ZrO2; those of hydrous zirconia synthesized at HCl concentrations greater than 1 mol/L showed a crystal structure change. The line width of the Raman bands increased with increasing H+ ion concentration. Analyzing the relationship between Raman band width and particle size revealed that the primary particle size of hydrous zirconia was controlled by the H+ and Cl− ions, because these ions interfered with the polymerization in a hydrolysis reaction. Based on the experimental results, the formation mechanism for primary particles of hydrous zirconia was determined. |
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