Effect of Mineralizers on the Crystallization of the Solid Solutions in the System ZrO<sub>2</sub>-CeO<sub>2</sub> under Hydrothermal Conditions

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  • TANI Eiji
    Research Laboratory of Engineering Materials and Department of Materials Science, Tokyo Institute of Technology
  • YOSHIMURA Masahiro
    Research Laboratory of Engineering Materials and Department of Materials Science, Tokyo Institute of Technology
  • SOMIYA Shigeyuki
    Research Laboratory of Engineering Materials and Department of Materials Science, Tokyo Institute of Technology

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  • 水熱条件下におけるＺｒＯ２‐ＣｅＯ２系固溶体の結晶化に及ぼす鉱化剤の効果
  • スイネツ ジョウケンカ ニ オケル ZrO2 CeO2ケイ コヨウタイ ノ ケ

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Abstract

The process of the crystallization of the solid solutions in the system ZrO2-CeO2 were studied under hydrothermal conditions. Samples prepared by coprecipitation method were treated under 100MPa at 600°C for 2-72h using distilled water or the solution of alkaline metal (Li, Na, K) fluorides, chlorides, bromides, carbonates, nitrates, sulfates, or hydroxides as mineralizers.<br>Monoclinic zirconia (m-ZrO2s.s.), ceria (CeO2s.s.), and/or ZrO2-rich solid solution (C1s.s.) phases were produced by the hydrothermal treatments of coprecipitated samples. The crystallite size of these phases and the production of C1s.s. depended on the species of anions used as the mineralizes.<br>The crystallite of m-ZrO2s.s. was grown larger than that of CeO2s.s. in the solution of fluorides, carbonates, or hydroxides. The crystallite of CeO2s.s. was grown larger than that of m-ZrO2s.s. in the solution of chlorides, bromides, or sulfates. The crystallite of m-ZrO2s.s. and CeO2s.s. did not increase significantly in the solution of nitrates or distilled water. In the solution of chlorides and bromides, C1s.s. was produced in addition to m-ZrO2s.s. and CeO2s.s..<br>The effect of each mineralizer might be different in the crystallization process which consists of the dissolution/precipitation and the structural rearrangement. The fluorides, carbonates, and hydroxides enhanced the dissolution/precipitation process, while the chlorides and bromides enhanced the structural rearrangement process in the crystallization of the solid solutions in the system ZrO2-CeO2.

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