Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 12, Issue 1, Pages 327-335Publisher
SPRINGER
DOI: 10.1007/s11051-009-9619-9
Keywords
Zirconia; Nanostructures; Microwave; Sintering; X-ray diffraction; Electron microscopy
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Funding
- Polish Ministry of Science and High Education
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This study is focused on the synthesis of zirconia nanopowders stabilized by 6% mol calcia prepared under hydrothermal conditions using microwave technology. Sodium hydroxide-based hydrolysis of zirconyl chloride solution containing calcium nitrate followed by microwave irradiation at the temperature of 220 degrees C for 30 min was sufficient to obtain white powders of crystalline calcia stabilized zirconia. By means of X-ray diffraction and transmission electron microscopy, it was shown that tetragonal zirconia nanocrystallites with a size of ca 7 nm and diameter/standard deviation ratio of 0.10 were formed. The effects of the [Ca(2+)] and [NaOH] as well as temperature and time of microwave irradiation on the density and specific surface area were evaluated. Sintering test of the tetragonal nanopowders at 1,300 degrees C in air was performed in a monomode microwave applicator. The sample was sintered to the density of 95% and the grain size, analyzed by field emission scanning electron microscopy, was in the range from 90 to 170 nm.
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