V.V. Polubinskii

Mechanisms for the formation of layered A4B3O12 compounds from coprecipitated hydroxocarbonate and hydroxide systems

We have established and analyzed the sequences of phase transitions in synthesis of layered compounds in the AnBn–1O3n family (

Crystal structure and luminescence of layered perovskites Sr 3 LnB III SnO 8 (B III = Sc, In)

{\text{A}}_3^{\text{II}}{\text{LnB}}_3^{\text{V}}{{\text{O}}_{{12}}}

Synthesis and crystal structure of layer perovskites Sr 3 LnB III SnO 8 (B III — Sc, In)

(AII = Ba, Sr, Ln = La, Nd, BV = Nb, Ta) and La4Ti3O12 with n = 4) from coprecipitated hydroxocarbonate and hydroxide systems, including steps involving the formation, solid-phase reaction, or structural rearrangement of intermediates.

Criteria of existence of one- and two-layer compounds (MeII, Ln)n+1BnO3n+1

The conditions and sequences of the phase transitions in the synthesis of laminar perovskite-like titanates AIIn-4 La4 Tin-1 O3n (AII = Ca, Sr) from mixtures of coprecipitated components were determined. The mechanisms for formation of the laminar structure of these products were found to entail three steps and are independent of the number of layers in the perovskite-like blocks and type of precipitating agent.

Crystal structure of layer niobatozirconate Sr 6 Nb 4 ZrO 18

The Sr₃LnInSnO₈ (Ln = La, Pr, Nd) and Sr₃LaScSnO₈ perovskites were synthesized and their structures have been determined by X-ray powder diffraction. The peculiarities of the structures and correlations composition - structure - luminescent properties have been discussed.

Layered perovskites Sr 3 LnB III TiO 8 (B III – Sc, In)

The Sr<inf>3</inf>LaTa<inf>3</inf>O<inf>12</inf> layered powdered perovskite-like compounds were obtained by heat treatment of co-precipitated hydroxy-carbonates. Photoluminescent (PL) properties of the Sr<inf>3</inf>LaTa<inf>3</inf>O<inf>12</inf> were investigated at the first time. Strongly overlapped components peaked at 535, 585 and 630 nm compos emission spectra of the materials under study. The luminescent data were analyzed and preliminary assumptions about origin of given spectra have been made.