Synthesis and characterization of layered titanium oxides NaRTiO4 (R = La, Nd and Gd)

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

“…The n ¼ 1 R-P phase NaLnTiO 4 (Ln ¼ lanthanide), consisting of (a) TiO 6 [19][20][21], is an interesting target for the intercalation research of water molecules. It was reported that when water molecules were intercalated in the interlayer of NaEuTiO 4 , the shift of the perovskite slabs toward the h1 1 0i direction occurred along the ion-exchangeable interlayer gallery [22].…”

Syntheses and Crystal Structures of the Compounds NaLnTiO4 (Ln = La, Pr, Nd)

“…. The lattice parameters obtained from the single-crystal X-ray diffraction data (Table 1) are slightly larger than those reported from Rietveld refinements of powder X-ray diffraction data (a = 3.77404(5) Å , c = 13.0146(2) Å for NaLaTiO 4 [12]; a = 3.75708(7) Å , c = 12.8711(3) Å for NaPrTiO 4 [12]; a = 3.7520(1) Å , c = 12.8214(5) Å for NaNdTiO 4 [13]). …”

“…The structures of these materials have been determined previously on the basis of Rietveld refinements of powder X-ray diffraction data [11][12][13]. However, we report here the first syntheses of single crystals of these materials, as well as the subsequent structure solutions from single-crystal X-ray diffraction data.…”

Structure determination of n=1 Ruddlesden–Popper compound HLaTiO4 by powder neutron diffraction

“…[11][12][13] The pH value and Na + ion concentration of the DCl solution increased during the contact with NaLaTiO 4 , suggesting that D + ion loadings into NaLaTiO 4 proceeded by an ion-exchange reaction. The exchange ratio of Na + /D + was estimated to be about 1.0, and it was found that all Na + ions were perfectly exchanged with D + ions from the pH change and analytical results by the atomic absorption.…”

“…[11][12][13] Prior to the preparation, La 2 O 3 was predehydrated at 900 • C for 9 h, because La 2 O 3 agent contains a small amount of La(OH) 3 . Stoichiometric amounts of TiO 2 and La 2 O 3 and 50% excess of Na 2 CO 3 were mixed, and heated at 900 • C for 30 min after preheating at 700 • C for 2 h in the air.…”