還元したCeO_2-ZrO_2固溶体の室温での発熱を伴う急激な酸化反応

概要

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The oxidation behavior of reduced CeO_2 and CeO_2-ZrO_2 solid solution (CZS) was studied by measuring the weight and temperature change during oxidization, in the near-room-temperature range. A flaming oxida tion at close to room temperature was observed in some of the reduced CZS. This oxidation takes place in the CZS reduced at much lower temperatures, 800℃ and 1000℃, compared with CeO_2, for which the tempera ture of 1400℃ or so is required for the occurrence of the flaming oxidation. The oxidation was not observed in the CZS reduced at a temperature higher than 1200℃. The material, which exhibited the flaming oxida tion, possessed a high oxygen storage capacity (OSC) and a large specific surface area. The dissolution of ZrO_2 into CeO_2 results in an increase of OSC and in the retardation of grain growth. These two effects lead reduced CZS to a flaming oxidation at close to room temperature.
社団法人日本セラミックス協会の論文
2002-10-01