A5043060104- Nuclear materials and radiation effects
- Advanced Condensed Matter Physics
- Nuclear Materials and Properties
- Multiferroics and related materials
- Radioactive element chemistry and processing
- Transition Metal Oxide Nanomaterials
- Gas Sensing Nanomaterials and Sensors
- Pigment Synthesis and Properties
- Microwave Dielectric Ceramics Synthesis
- Catalysis and Oxidation Reactions
- Crystallization and Solubility Studies
- Ferroelectric and Piezoelectric Materials
- Magnesium Oxide Properties and Applications
- Electronic and Structural Properties of Oxides
- Advanced materials and composites
Saint Petersburg State Electrotechnical University
2021-2024
Ioffe Institute
2019-2024
N. I. Lobachevsky State University of Nizhny Novgorod
2021
St. Petersburg State Technological Institute
2019-2020
The paper deals with a study of the effect which hydrothermal fluid pH has on formation pyrochlore-structured phase in Bi 2 O 3 -Fe -WO system.It was shown that at 1 and 8, particles crystallite sizes 38 118 nm, respectively, is accompanied by WO 6 compound Aurivillius structure.At values from to 7, only nanocrystalline variable composition are formed.Under these conditions, dependence average size crystallites extreme, as increases ∼ 67 nm up 126 5 then decreases 102 7. samples obtained 3-4...
The concentration stability field localization of the pyrochlore-structured compounds variable composition formed in Bi 2 O 3 -Fe -WO system under hydrothermal conditions at a temperature T = 200 • C and pressure P 7 MPa was determined.It found that is longitudinally limited within atomic ratios 0.47 < Bi/W 1.25, transverse direction 1.14 Bi/Fe 1.87.It shown pyrochlore phase cubic unit cell parameter depends on compound chemical as follows: it increases linearly from ∼ 10.3319 Å to 10.4199...
The present paper investigates features of a (Bi, Fe, ) 2 (Fe, W) O 6 δ cubic pyrochlore-structured phase (hereinafter BFWO) formation in the Bi 3 -Fe -WO -(H O) system under hydrothermal synthesis conditions at T < 200 • C and range pH 1.It was found that BFWO is formed even when amorphous precursor suspension less than 100 C. particles have conditionally spherical morphology are polycrystalline.The dependency average particle size on temperature correlates well with crystallite this...
Nanocrystalline Bi 2 WO 6 was synthesized by means of hydrothermal treatment.It shown that the formation rate bismuth tungstate nanocrystals determined presence clusters formed at stage precipitation and having same structure as , morphology particles during treatment depended on medium's pH.