Influence of Water Vapor on the Crystallization of ZrO<sub>2</sub> from Zr(OH)<sub>4</sub>

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  • 水酸化ジルコニウムからのＺｒＯ?S２?Tの結晶化に及ぼす水蒸気の影響
  • スイサンカ ジルコニウム カラ ノ ZrO2 ノ ケッショウカ ニ オヨボス

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Effects of the condition to prepare Zr(OH)4, the grain size and the heating atmosphere on the crystallization of tetragonal and monoclinic ZrO2 were studied. The conditions to precipitate Zr(OH)4 had little influence on the results. Prolonged drying increased the content of monoclinic ZrO2 because of the structure change in the hydroxide by aging in the process of drying. The coarser grains of the hydroxide or the lower heating rate increased the content of monoclinic ZrO2. The crystal structure of ZrO2 obtained from Zr(OH)4 was related to the atmosphere in which Zr(OH)4 was heat-treated: monoclinic ZrO2 was crystallized in water vapor and tetragonal ZrO2 under reduced pressure. The effect of water vapor on the crystallization of ZrO2 was remarkable rather than in the formation of amorphous ZrO2. These results suggest that water vapor decreases the difference of surface energies of tetragonal and monoclinic ZrO2.

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