Hydrothermal Synthesis of Cerium(IV) Oxide |
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Authors: | Masanori Hirano Etsuro Kato |
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Affiliation: | Department of Applied Chemistry, Aichi Institute of Technology, Yachigusa, Yakusa, Toyota, 470–03 Japan |
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Abstract: | CeO2 powders have been prepared from cerium(III) nitrate, cerium(IV) sulfate, and cerium(IV) ammonium sulfate under hydrothermal conditions at 120° to 200°C for 5 to 40 h. The effects of the starting cerium compounds, hydrothermal treatment temperature, and the concentration of the solutions on the crystal growth of CeO2 were investigated. CeO2 powders hydrothermally synthesized at 180°C for 5 h from cerium(IV) salts had very fine particle sizes (30 Å); on the other hand, the powder from the cerium(III) salt had a relatively coarse particle size (160 Å). Although the crystallite size of the powder synthesized from the cerium(IV) compounds depended on the treatment temperature, that from the cerium(III) compound was insensitive to the treatment temperature. The mechanisms for the growth of CeO2 particles under hydrothermal conditions are discussed. |
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