VOL 87, No. 2 (2014)

New oxyfluoride glasses of the SiO ₂ - PbO - PbF ₂ - CdF ₂ system containing europium ions Eu ³⁺ have been synthesized and ytterbium Yb ³⁺, their physicochemical properties, optical absorption and up-conversion luminescence were studied. Upon excitation in the IR spectral range with a commercially available laser diode, intense orange-red luminescence (color coordinates x = 0.64, y = 0.36) with a maximum at 612 nm was obtained. Glass is promising for the production of nanophase luminescent glass ceramics for use in up-conversion phosphors and solid-state lasers.

An effective mathematical model of elastic electronic polarization of a condensed matter material is considered. The results of computer modeling of optical spectra of four raw crystalline oxides, as well as the spectral properties of three different samples of refractory glasses resulting from them, are presented.

The microstructure of the fracture surface of a filament of aluminum oxide and the inhomogeneity of the structure of a filament of aluminum oxide in the radial direction are investigated. The thickness of the strong shell and the structure of the weaker core of the filament have been determined. Based on the results of tensile tests to rupture of filaments of different diameters, an assumption was made about the effect of the shell thickness on the strength of filaments made of aluminum oxide.

Nanocrystalline powders (Zr _1-x Y _x) O _y were synthesized by the combined method of coprecipitation and hydrothermal decomposition. Granulometric composition certification, X-ray phase analysis were carried out, pycnometric density of the synthesized powder was determined.

The synthesis of blue pigment by coprecipitation of nickel and aluminum from nitrate solutions with anionite AB-17-8 in the OH-form with subsequent calcination of the precursor at a temperature of 750 ° C has been proposed. The resulting product was investigated by methods of thermographic and X-ray analysis, as well as spectrophotometry (IR and diffuse reflection). According to the results of electron microscopy, the size of the pigment particles was 0.3 ?m.

The properties of glass fiber laminates based on inorganic aluminophosphate binders and glass fillers of various structures have been investigated. The mechanical and dielectric properties of STAF glass fiber laminates based on silica, glass and basalt fillers, as well as lightweight glass fiber laminates filled with microspheres are given. Glass fiber laminates based on an inorganic aluminophosphate binder can be used for the manufacture of structural and radio engineering products that operate for a long time at high temperatures.

A review of synthesis methods and properties of phosphors based on yttrium aluminum garnets, activated with rare earth elements, for LED light sources is presented. The dependences of the spectral characteristics of luminophores on their compositions are presented.

Within the framework of the one-dimensional problem of the evaporation of an absorbing layer of a material with an "instantaneous" release of laser pulse energy, an analytical relationship is obtained for calculating the evaporated mass of a substance per unit of input energy. This ratio makes it possible to determine the optimal processing mode for glassy and ceramic materials with volumetric absorption of laser radiation. An experimental verification of the adequacy of the computational model has been carried out.

The effect of complex organomineral deflocculators based on oxyphenolfurfural oligomers on the surface tension at the liquid-gas interface, as well as on the value of the contact angle and the work of wetting the surfaces of aluminum oxide, marble and quartz is shown. The phenomenon of synergism was confirmed when introducing complex organomineral deflocculators with an optimal ratio of components into slip ceramic masses containing alumino-oxygen compounds.

The effect of a complex thinner based on soda, water glass and oxyethylidene diphosphonic acid on the rheological and casting properties of the Stephan Sсhmidt 13250 clay suspension and on the mechanical properties of dried and fired samples has been studied. The additive allows to reduce the moisture content of the clay suspension while maintaining its operating parameters. An increase in the strength and density of dry and fired clay specimens is observed, as well as a decrease in shrinkage and porosity.