G. M. Kuz’micheva

Synthesis, characterization, and properties of nanoscale titanium dioxide modifications with anatase and η-TiO2 structures

Nanoscale titanium dioxide modifications with anatase and η-TiO2 structures have been obtained by the sulfate method. Bands characteristic of the η-TiO2 phase are selected in the Raman and IR spectra of the samples containing this phase. A study of the properties of synthesized samples applying a complex of physicochemical methods revealed that nanocrystals in the samples containing phases of different modifications differ in size, structure, and surface composition. It is shown that the abovementioned nanoscale modifications are characterized by the efficient sorption of As (V), Bi (III), and V (V) from aqueous media; the degree of sorption depends on the size and structural form of nanocrystals.

Synthesis and morphology of anatase and η-TiO2 nanoparticles

Samples containing anatase and η-TiO2 nanoparticles have been prepared from titanyl sulfate solutions and characterized by X-ray diffraction, transmission electron microscopy, and electron diffraction. Unit-cell parameters of η-TiO2 have been proposed that do not rule out a relationship between the anatase and η-TiO2 structures. The samples containing anatase and η-TiO2 differ in crystallite size and specific surface area and consist of agglomerates of particles of various sizes covered with an amorphous layer. We have studied the effect of synthesis conditions on the ability to prepare a particular titania polymorph with various functional characteristics.

Composition, structural parameters, and color of langatate

Langatate crystals with the nominal composition La3(Ga0.5Ta0.5)Ga5O14 grown by Czochralski pulling along 〈0001〉 have been studied by X-ray and neutron diffraction before and after postgrowth annealing in air and vacuum. Their compositions are determined, the relationship between the Ga/Ta ratio and unit-cell parameters is established, and their color (colorless, yellow, and orange crystals) is shown to depend on their oxygen content and the growth and annealing conditions. Vacuum annealing at sufficiently high temperatures leads to precipitation of a green phase, La(Ta,Ga)3+O3.

Symmetry of (Na0.5R0.5)MO4 crystals (R = Gd, La; M = W, Mo)

AbstractKinetic order-disorder phase transitions (space group space group

Point Defects in Langatate Crystals

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Composition, microstructure, and properties of anatase and η-TiO2 nanoparticles

↔ space group I41/a) have been considered for nonactivated and activated scheelite compounds (Na0.5Gd0.5)WO4 (NGW), (Na0.5Gd0.5)MoO4 (NGM), (Na0.5La0.5)WO4(NLW), and (Na0.5La0.5)MoO4 (NLM) synthesized by the Czochralski method and structural and growth sources of crystal dissymmetrization have been suggested. For NGW, it was shown that an increase in the difference between the content of Gd and Na in two positions of the structure with space group

Effect of sulfate synthesis conditions on characteristics of samples with the nanosized η-TiO2 modification

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