Formation of zirconia titanate solid solution from alkoxides

In the system ZrO2-TiO2, ZrTiO4 solid solutions prepared by the simultaneous hydrolysis of zirconium and titanium alkoxides crystallize at low temperatures from amorphous materials between 30 and 70 mol% TiO2. As zirconium is substituted for titanium, the solid solutions can be indexed in an orthorhombic unit cell. The volume of the unit cell decreases continuously with increasing TiO2 content. At higher temperatures the solid solutions decompose into ZrTiO4 and either ZrO2 (monoclinic) or TiO2 (rutile), depending on the starting composition