Formation of the complex oxide NaNdTiO4

Abstract

The processes of phase formation in the Na 2 CO 3 -TiO 2 and Na 2 CO 3 -TiO 2 -Nd 2 O 3 systems are investigated in the temperature range 600-900 ° C. The high-temperature solid-phase reactions underlying the process of formation of complex oxide NaNdTiO 4 are studied. It is established that the synthesis of the NaNdTiO 4 compound occurs through the reaction of the intermediate product Na 8 Ti 5 O 14 with neodymium oxide in the temperature range 720-780 ° C. The optimum method is proposed for synthesizing NaNdTiO 4 , which makes it possible to reduce the temperature of the synthesis, to avoid the formation of impurities, and to obtain the product in a finely dispersed state.

Study of photocatalytic activity of layered oxides: NaNdTiO4, LiNdTiP4, and HNdTiO4 titanates

“…The layered titanate NaNdTiO 4 was synthesized by the solid-phase method in air under atmospheric pressure according to the procedure developed when studying the mechanism of its formation and its thermal stability [5,6]. As initial reagents we used stoichiometric amounts of Na 2 CO 3 , TiO 2 , and Nd 2 O 3 corresponding to the equation of reaction (1).…”

Phase transformations during HLnTiO4 (Ln=La, Nd) thermolysis and photocatalytic activity of obtained compounds

“…Calcination was carried out at 780 1C for 2 h and then continued at 900 1C for 3 h in air according to results of the formation and thermal stability investigation of NaNdTiO 4 [30,31]. The protonated forms HLnTiO 4 were prepared from NaLnTiO 4 by ion exchange reaction with a three-fold excess of 0.1 M HCl.…”

Low‐Temperature Transformations of Protonic Forms of Layered Complex Oxides HLnTiO4 and H2Ln2Ti3O10 (Ln = La, Nd)

“…In case of NaLnTiO 4 , following temperature mode has been used: fast heating to 780 ∘ C, calcinating at 780 ∘ C for 2 hours, fast heating to 900 ∘ C, and calcinating at 900 ∘ C for 3 hours [13]. This temperature mode was selected regarding the formation beginning of NaLnTiO 4 at 780 ∘ C, while Na 2 CO 3…”