CHEMICAL PROBLEMS
MULTI-3D MODELING OF PHASE DIAGRAM OF PbTe-Bi2Te3-Sb2Te3 SYSTEM
Abstract Using the analytical option of the Origin Lab computer program, the analytical dependences of the liquidus temperature on the composition for the PbTe-Bi2Te3, PbTe-Sb2Te3, Bi2Te3-Sb2Te3 boundary systems of the PbTe-Bi2Te3-Sb2Te3 ternary system were determined. Based on these dependencies and thermal analysis data of the ternary system, the analytical model of the temperature-composite dependence of […]
CONTENTS
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STUDY OF PROCESSE OF OBTAINING MONOPOTASSIUM PHOSPHATE BASED ON MONOSODIUM PHOSPHATE AND POTASSIUM CHLORIDE
Abstract Results of studies of the process of conversion of the flotation potassium chloride of the Tyubegatan deposit with solutions of sodium dihydrogen phosphate obtained on the basis of purified extraction phosphoric acid from phosphorites of the Central Kyzylkum to potassium dihydrogen phosphate are presented. The effect of the ratio of the components, S:L on […]
USE OF GLYCIDYLOXYMETHYL SUBSTITUTED PHENYL (BENZYL) CYCLOPROPANES IN THE COMPOSITION OF EPOXIDE OLIGOMER ED-20 AS DILUENTS
Abstract By the interaction of phenyl (benzyl) substituted cyclopropylcarbinols with epichlorohydrin, the glycidyloxymethyl substituted phenyl(benzyl)cyclopropanes, used as active diluents of epoxide resin ED-20, were synthesized. It found that the addition of the obtained epoxy compounds to the epoxide resin decreases the viscosity of the resin and increases the lifetime of the compositions. The high degree […]
PHASE EQUILIBRA IN THE Ag2Se–Ag8GeSe6–Ag8SiSe6 SYSTEM AND CHARACTERIZATION Of the Ag8Si1-xGexSe6 SOLID SOLUTIONS
Abstract Phase equilibria in the Ag2Se–Ag8SiSe6–Ag8GeSe6 system were studied by differential thermal analysis and X-ray diffraction thechnique. Based on the experimental results and literature data, the projection of the liquidus surface of the Ag2Se–Ag8SiSe6–Ag8GeSe6 system, the isothermal section at 300 K and some polythermal sections of the phase diagram were constructed. It was determined that […]
HYROGEN BOND IN CRYSTAL STRUCTURE OF SALTS OF SYMMETRIC POLYMETHYLFERRICINIUM CATİONS (SYM.[(CH3)mC5H5–m]2Fe+X–, m=3,4,5 or МеnFc+X–, n = 6, 8, 10; X– = PF6–, BF4–, Br3–)
Abstract The article explains reasons of elongation (0.019 Å) of the bond between iron–cyclopentadienyl ring in the 1,2,4,1,2,4-hexamethylferricinium (sym. Ме6Fc+) cation formed due to the one-electron oxidation of iron atom of sym.1,2,4,1,2,4-hexamethylferrocene (sym. Ме6Fc) molecule which is 2-2.5 times smaller (0.04–0.05 Å) than that observed in pairs of ferrocene/ferricinium (Fc/Fc+), sym. octamethylferrocene/sym.octamethylferricinium (Ме8Fc/Me8Fc+) and decamethylferro- […]
THEORETICAL ASPECTS OF VIBRATIONAL SPECTROSCOPY OF CONDENSED SYSTEMS WITH IMPURITY PARTICLES
Abstract Some problems of vibrational spectroscopy of particles in condensed systems are considered in this work. One of the aspects of theoretical research is the study of the vibrational properties of individual particles in view of the nano-dimension of the molecules of the condensed system surrounding the particle. Using the apparatus of temperature, Green functions […]
SYNTHESIS OF ALKOXYCARBONYLMETHYL ESTERS OF THIOACETIC AND THIOBENZOIC ACIDS AND THEIR INVESTIGATION AS ADDITIVES TO LUBRICATING OILS
Abstract The method for obtaining alkoxycarbonylmethyl esters of thioacetic acid, based on the interaction of mercaptoacetic acid esters with acetic anhydride in an alkaline medium was proposed. It showed that an alternative way to obtain alkoxycarbonylmethyl esters of thioacetic acid is the reaction of mercaptoacetic acid esters with acetyl chloride in the presence of equimolar […]