N. S. Slobodyanik

Crystal structure of a novel cubic pyrophosphate WP2O7

Abstract The crystal structure of a novel pyrophosphate WP 2 O 7 has been studied by X-ray powder diffraction. It was found that the crystal structure of WP 2 O 7 belongs to the well-known MoP 2 O 7 structure type ( a =7.9502 A). The tetravalent state of tungsten in the pyrophosphate has been confirmed by magnetic susceptibility measurements.

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 (

Effect of Neodymium(III) Dopants on the Fluorescence Intensity of Bismuth(III) Phosphomolybdate

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

Characteristics of the structure and crystallochemical criteria for the existence of compounds of the type AnBnO3n+2

(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.

Phase transformations in formation of five-layer perovskites Ca5−xSrxTiNb4O17 (x=0−5) from coprecipitated hydroxocarbonate systems

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.

Synthesis of three-layered titanates BaLn 2 Ti 3 O 10 in systems with co

A solid-phase method is proposed for the preparation of K2Bi(PO4)(MnO4) with mean grain diameter 100 nm doped with Nd3+ ions in the concentration range from 1.0 to 10 mole %. The activator replaces a Bi(III) ion in the crystal lattice. The position of the emission bands of the resultant luminophores in the range 800-1150 nm is independent of the activator content, while the luminescence intensity is greatest for 5 mole % dopant.

Synthesis of three-layered titanates BaLn2Ti3O10 in systems with coprecipitated hydroxocarbonates

We have determined the characteristic features of formation of layered perovskite-like compounds of the type AnBnO3n+2 (n = 5, 6) from systems of coprecipitated hydroxides or hydroxocarbonates. We have established that the process of formation of the crystalline five-layer or six-layer perovskite-like structure of compounds of the AnBnO3n+2 type occurs only according to a two-step mechanism.