Low-Temperature Direct Synthesis of CeO2–ZrO2 Solid Solution Nanoparticles by a Hydrothermal Method
Well-crystallized CeO2-ZrO2 solid solution nanoparticles were successfully prepared by a hydrothermal method in a single step at 120 °C, for 6 h without any post heat treatment. The particle sizes of 6 ± 3 nm by surface area measurements are in good agreement with crystallite sizes of 6 ± 3 nm by X-ray diffraction. Transmission microscopy also confirmed the formation of crystals of 5-8 nm in the products. In the formation of the homogeneous solid solutions the complete oxidation of Ce3+ to Ce4+ in the precipitated gels seems to be one of the important steps. The solid solutions contained several wt % water, but it was expelled by calcining ≥600 °C. The heating of the samples brought about grain growths, but did not change the phases. The specific areas of 120-200 m2/g of as-prepared samples were decreased to 4-14 m2/g by heating at 900 °C for 4 h.
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Document Type: Research Article
Publication date: 2004-03-01
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