On the Hydrolysis Products of ZrOCl<SUB>2</SUB> Solution

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  • 塩化ジルコニル水溶液の加水分解生成物について

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Zirconyl chloride solutions (O.01 to 1.8 mol/l) and the same with various amounts of HCl and urea were heated for 5 to 170 hr at their boiling temperatures. The hydrolysis products under different conditions were examined by means of X-ray diffractometry, IR spectrometry, electron microscopy and thermal analysis.<BR>The particle shape and size o f the products depend on ZrOCl2 concentration: fine crystals (about 200 Å) are formed in 0.01 mol/l whereas cube-like and sphere-like particles (about 1000 Å ) resulting from coagulation of fine crystals (about 100 Å ) are formed in O.1 mol/l and 0.3mol/l, respectively (Fig.2).<BR>Two kinds of products were obtained depending on the concentration of HCl: hydrous zirconia is formed in the solution whose concentration of HCl being lower than about 1 mol/l and the compound containing about 5 wt% Cl is formed in much more concentrated solution.<BR>The hydrous zirconia has a monoclinic crystal structure. A small amount of hydrous zirconia having a tetragonal or cubic crystal structure is formed together with the monoclinic hydrous zirconia when the concentration of HCl is lower than 0.2 mol/l.<BR>The hydrous zirconia particles are dehydrated without any chan g es in particle shape, size and crystal structure when they are heated at 400°C in air. The compound containing Cl decomposes to ZrO2 with monoclinic crystal structure at 400°C in air.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1976 (3), 425-430, 1976-03-10

    The Chemical Society of Japan

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