Abstract
Three kinds of titanyl(IV)-oxalato compounds were obtained as powders by mixing an aqueous solution of TiOSO4⋅nH2O with an aqueous solution of K3[Cr(OX)3]⋅3H2O, K3[Fe(0X)3]⋅3H2O or K3[Co(OX)5]⋅3 H2O0. The compositions of these compounds were foun d to be (TiO)2(OX)(OH)2(H2)4 (Fri-Cr1), (TiO)g(OX)(OH)2(H2O)2 ([Ti-Fe]) and (TiO)19Co(OX)6(SO4)8(OH)12(H2O)13 ([Ti-Co]), respectively. Traces of chromium or iron w ere contained in the corresponding compounds. The Ti/M atomic ratios (M=Cr, Fe or Co) were about 45, 120 or 19, respectively. All of these compounds released almost all water molecules at about 200°C and gave their oxides above 500°C. The powder X-ray diffraction spectra suggested that titanium(IV) oxides formed by igniting at about 850°C in air were anatase-, rutiie-type and the mixture of both types for [Ti-Cr], [Ti-Co] and [Ti-Fe], respectively.
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