Low-Temperature Direct Synthesis of CeO2–ZrO2 Solid Solution Nanoparticles by a Hydrothermal Method
Authors: Anwar Ahniyaz; Takeshi Fujiwara; Takahiro Fujino; Masahiro Yoshimura
Source: Journal of Nanoscience and Nanotechnology, Volume 4, Number 3, March 2004 , pp. 233-238(6)
Publisher: American Scientific Publishers
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Abstract:
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.
Keywords: CEO2-ZRO2; SOLID SOLUTIONS; NANOPARTICLES; HYDROTHERMAL; LOW-TEMPERATURE SYNTHESIS; SOLUTION PROCESSING; CUBIC FLUORITE STRUCTURE
Document Type: Research article
DOI: 10.1166/jnn.2004.028
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