Titanates, typically potassium titanates (K₂O · nTiO₂, where n = 2, 4, 6 and 8), have been expected to be useful as a novel functional materials. The di- (K₂Ti₂O₅) and tetratitanates (K₂Ti₄O₉) possess a layered structure and have a great ion-exchange abilities. Tunnel structures have compounds with lower alkali-metal content. The hexatitanate (K₂Ti₆O₁₃) shows a high thermal insulating ability and chemical stability. Compare to these compounds octatitanate (K₂Ti₈O₁₇) has been little studied.

Potassium octatitanate possess stable tunnellike structure and exhibits characteristic properties such like as a high thermal insulating capacity and compared to K₂Ti₆O₁₃ a high ion conductivity. Because of these features it has been used as advanced reinforcing material for the composite and frictional material for breakes. However, it is difficult to obtain K₂Ti₈O₁₇ using conventional method (solid-state reaction) compared to other alkali-metal titanates. From literature data it is known that K₂Ti₈O₁₇ had been synthesized by hydrothermal method or host-quest reaction followed by dehydration and ion-exchange reaction. In this respect, the ion-exchange reaction method, is one of the promising synthesis method.

In the present work, we display preliminary investigation of synthesis and decomposition of K₂Ti₈O₁₇ using ion-exchange reaction method. This study was depend on treatment the fibrous K₂Ti₄O₉ with different concentrations of hydrochloric acid. Next the samples were dried and heated in determined temperatures (400÷700ºC). X-ray powder diffraction (XRD) method was used to study the formation and decomposition of K₂Ti₈O₁₇.

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