期刊
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
卷 17, 期 3, 页码 219-225出版社
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1008764005816
关键词
sol-gel zirconia; electron irradiation; irradiated alkoxide solution; tetragonal zirconia stabilization; gelling acceleration; gelling without catalyst
Sol-gel zirconia precursor, zirconium n-butoxide in ter-butanol, was irradiated with 1.3 MeV electrons to a dose of 330 KGy. Gelling was instantaneously produced when an aqueous solution of sulfuric, hydrochloric or acetic acid was added to the irradiated solution; no hydrolysis catalyst was required. Samples were characterized with X-ray powder diffraction, infrared spectroscopy, and electron paramagnetic resonance. The electron irradiation accelerated hydrolysis and condensation, which avoided the stabilization of the tetragonal phase via carboxyls, and decreased the capability of sulfate ions to stabilize it. These results suggest that the stabilization of the tetragonal phase of sol-gel zirconia via carboxyl and sulfate ions depends on their diffusion in the sol.
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