Ion-exchange reactions in the structure of perovskite-like layered oxides: I. Protonation of NaNdTiO4 complex oxide

Abstract

The behavior of perovskite-like NaNdTiO4 complex oxide in acid aqueous solutions was studied. By the X-ray and thermogravimetry analyses the instability of NaNdTiO4 in aqueous solutions was found, which is determined by the sodium cation exchange for protons and by water molecules intercalation into the interlayer space of the crystal structure. The proton-containing layered oxides HNdTiO4 and H x Na1−x NdTiO4·yH2O were obtained (1 < x < 0.64, 0 < y < 0.47). The structure of the H0.73Na0.27NdTiO4·0.3H2O compound was refined.