Ion Exchange of Layered Alkali Titanates (Na 2 Ti 3 O 7 , K 2 Ti 4 O 9 , and Cs 2 Ti 5 O 11 ) with Alkali Halides by the Solid-State Reactions at Room Temperature.

Ion exchange of layered alkali titanates (Na ₂ Ti ₃ O ₇ , K ₂ Ti ₄ O ₉ , and Cs ₂ Ti ₅ O ₁₁ ) with several alkali metal halides surprisingly proceeded in the solid-state at room temperature. The reaction was governed by thermodynamic parameters and was completed within a shorter time when the titanates with a smaller particle size were employed. On the other hand, the required time for the ion exchange was shorter in the cases of Cs ₂ Ti ₅ O ₁₁ than those of K ₂ Ti ₄ O ₉ irrespective of the particle size of the titanates, suggesting faster diffusion of the interlayer cation in the titanate with lower layer charge density.