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Low-Temperature Direct Synthesis of CeO2–ZrO2 Solid Solution Nanoparticles by a Hydrothermal Method

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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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Keywords: CEO2-ZRO2; CUBIC FLUORITE STRUCTURE; HYDROTHERMAL; LOW-TEMPERATURE SYNTHESIS; NANOPARTICLES; SOLID SOLUTIONS; SOLUTION PROCESSING

Document Type: Research Article

Publication date: 2004-03-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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