Abstract
A solution of dilute zirconium oxide sulfate was hydrothermally treated at 240°C for different times. Metastable pseudo-zirconium oxide sulfate (PZOS) was formed at first with a decrease in SO42- ion concentration and then monoclinic ZrO2 was formed with an increase in SO42- ion concentration as a result of dissolution of PZOS. Monoclinic ZrO2 particles had crystals with elongated c-axis: flaky single crystals and bundles of (100) twin crystals. It seemed that the formation of two crystal types depends on the difference of crystal nuclei formed by dissolution of PZOS. Monoclinic ZrO2 particles formed from solutions of low Zr and high H2SO4 at ZS(0.01/0.3), which indicates the mixed solution of 0.01mol/l zirconyl carbonate and 0.3mol/l H2SO4, and ZS(0.01/0.4) were like chestnut buries. It was thought that the morphology change of monoclinic ZrO2 formed hydrothermally was caused by formation and dissolution of metastable PZOS and ZOS, the type of Zr-O solute species, and nucleation and growth of monoclinic ZrO2, which were affected by the concentration of sulfuric acid in the solution.
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