Coprecipitation of Titanium(IV)and Iron(III)Complex Salts from Peroxide-Fluoride Solutions

摘要

Because the salts(NH4)3TiO2F5 and(NH4)3FeF6 are isostructural,precipitation of the titanium peroxy salt from the(NH4)2TiF6-(NH4)3FeF6-NH4F-H2O2 system is accompanied by crystal-chemical substitution of ions.As a result of partial peroxolysis,the iron salt coprecipitates with ammonium peroxypentafluorotitanate.If the degree of precipitation is higher than 20%,TiO2 samples of high whiteness can be prepared from the hydrolysis product isolated from such solutions,after annealing at 850°C.