Novel protonated and hydrated n=1 Ruddlesden-Popper phases, HxNa1−xLaTiO4·yH2O, formed by ion-exchange/intercalation reaction

New derivatives of layered perovskite compounds with H3O+ ions, H+ ions and water molecules in the interlayer, HxNa1−xLaTiO4·yH2O, were successfully synthesized by an ion-exchange/intercalation reaction with dilute HCl solution, using the n=1 member of Ruddlesden-Popper phase, NaLaTiO4. The thermogravimetric analysis and high-temperature powder X-ray diffraction suggested the existence of the secondary hydrated phase by dehydrating HxNa1−xLaTiO4·yH2O at 100 °C.