Zr(SO_4)_2-Zr(OH)_4-H_2O系の加熱加水分解生成物

概要

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Mixtures of Zr (SO_4)_2 Zr (OH)_4 H_2O system were hydrothermally treated at temperatures from 160 to 240℃ for various time periods. A metastable compound, pseudo zirconium oxide sulfate (PZOS) , was formed at the early stage of the hydrothermal process. In solutions containing 0.4 mol/l of H_2SO_4, an isotropic, elongated, flaky m ZrO_2 particles were formed subsequently, and the particle size increased with increase in treatment time. The m ZrO_2 particles crystallized from the PZOS by discharging SO_4^<2-> ions. In solutions containing 1.0 or 1.5 mol/l of H_2SO_4, however, the sub sequent product was zirconium oxide sulfate (ZOS) particles, which probably resulted by the nucleation and crystal growth mechanism. The yield of ZOS particles or elongated, flaky m ZrO_2 particles from Zr (SO_4)_2 Zr(OH)_4 H_20 system was higher than that from Zr(SO_4)_2 H_2O system. This method in this study is expected to be useful in the mass volume production of ZOS or m ZrO_2 particles.
社団法人日本セラミックス協会の論文
1994-09-01