Phase formation in the ScPO4-Na3PO4-Li3PO4 ternary system

The 950°C isothermal section of the ScPO₄-Na₃PO₄-Li₃PO₄ three-component system was plotted and studied; one-, two-, and three-phase fields were bounded. Three solid solution fields exist in the title system: one based on LiNa₅(PO₄)₂ complex phosphate (olympite structure), another on scandium-stabilized high-temperature Na₃PO₄ phase Na_{3(1 − x)}Sc _x/3□_2/3x PO₄ (space group Fm3m), and the third on Na₃Sc₂(PO₄)₃ (NASICON structure). All phases found in the title system are derivatives of phases that exist in its subsystems. Lithium-for-sodium isovalent substitutions in Na₃Sc₂(PO₄)₃ considerably increase the NASICON-type solid solution field but negatively influence the conductivity of the phase.     

Femtosecond laser writing of subwave one-dimensional quasiperiodic nanostructures on a titanium surface

One-dimensional quasiperiodic structures whose period is much smaller than the wavelength of exciting radiation have been obtained on a titanium surface under the multipulse action of linearly polarized femtosecond laser radiation with various surface energy densities. As the radiation energy density increases, the one-dimensional surface nanorelief oriented perpendicularly to the radiation polarization evolves from quasiperiodic ablation nanogrooves to regular lattices with subwave periods (100–400 nm). In contrast to the preceding works for various metals, the period of lattices for titanium decreases with increasing energy density. The formation of the indicated surface nanostructures is explained by the interference of the electric fields of incident laser radiation and a surface electromagnetic wave excited by this radiation, because the length of the surface electromagnetic wave for titanium with significant interband absorption decreases with an increase in the electron excitation of the material.     

Dirac Quantum Geometrodynamics

Russian Physics Journal - With the help of the Dirac procedure for extracting the root from the Hamiltonian operator of the free gravitational field in flat superspace-time, we have constructed a...     

Composite cellulose-polyacrylonitrile films prepared from solutions in a mixed solvent, 1-butyl-3-methylimidazolium chloride-dimethylformamide

Composite films were prepared from solutions of cellulose-polyacrylonitrile blends in a mixed solvent, 1-butyl-3-methylimidazolium chloride-dimethylformamide. The rheological properties of the solutions were studied. The structural organization and heat resistance of the composite films were examined by X-ray diffraction and thermal gravimetric analysis. Introduction of cellulose into the polyacrylonitrile matrix decreases the temperature of polyacrylonitrile cyclization onset and enhances the heat resistance of the composite films.     

Sulfur and nitrogen oxide conversion in air by microsecond electron beams

Sulfur and nitrogen oxide conversion in an ionized gaseous mixture modeling the composition of flue gases from thermal power plants is studied experimentally. A pulsed microsecond beam of electrons is used as an ionization source. Oxides of both elements are shown to influence the conversion process. Possible kinetic mechanisms for removing the oxides from the gaseous mixture are discussed.     

The Bargellini reaction in a series of heterocyclic thiols

The synthesis of sterically hindered carboxylic acids based on heterocyclic thiols has been performed via the Bargellini reaction. Structure of the obtained compounds has been confirmed by means of X-ray diffraction analysis.     

Carbazoles Stannylation

Stannylation of 3,6-dibromocarbazoles with lithium trimethylstannanide in THF was investigated. At treating 3,6-dibromo-9-alkylcarbazoles with lithium trimethylstannanide arise 3,6-bis(trimethylstannyl)-9-alkylcarbazoles. The 3,6-dibromocarbazole unsubstituted at nitrogen affords lithium 3,6-bis(trimethylstannyl)-carbazol-9-yl. The conditions of its generation, alkylation, and conversion into 3,6-bis(trimethylstannyl)carbazole are considered.