Low-Temperature Preparation of Nano-Sized Particles of Some Alkali Titanates by Solution Process

Alkali ions were co-precipitated with titanium hydroxide gels. When Ti(SO4)2 solution was added to KOH solution with K:Ti=10:1 (in molar ratio), the potassium remains in the precipitated gel, in spite of several times of washing. Excess amount of alkali and pH>9 were the essential conditions for the co-precipitation. Similar results were obtained for the other alkali elements; Li and Na. Nano-sized particles of K2O-6TiO2, Li2O-TiO2 and Na2O-3TiO2 with 20-30 nm in size were respectively obtained by heating the precipitates at 500 or 600°C.In addition, the thin films of alkali titanates were obtained on Si substrate by dripping Ti(SO4)2 solution and MOH solution for 30-60 min.