Abstract
New layered perovskite compounds, Na1-xHxLaTiO4•yH2O, in which water molecules and protons were included were successfully synthesized by an ion-exchange reaction, using the n = 1 member of Ruddlesden-Popper phase, NaLaTiO4. Powder X-ray diffraction data showed that the layered structure changed from space group P4/nmm with a = 3.776(1) and c = 13.028(5) Å to I4/mmm with a = 3.747(1) and c = 28.074(5) Å after the ion-exchange reaction. From the change in space group, it was considered that the perovskite layers were transformed from staggered to eclipsed configuration after the reaction. On heating, the intercalated water molecules and protons were dehydrated with three steps on TG curves. After the dehydration, formation of three-dimensional perovskite phase was observed.
