эвтектика

Study Phase Triangles LiNO3 – NaNO3 – NaI, LiNO3 – KNO3 – KI and LiNO3 – RbNO3 – RbI Ternary Mutual Range Systems Li,M || I,NO3 (M – Na, K, Rb)

Authors: Maltseva A. V., Gubanova T. V., Garkushin I. K.

By differential scanning calorimetry (DSC) was first investigated experimentally determined complexes and phase characteristics of equilibrium points of the invariant three-phase triangles reciprocal systems of several Li,M || I,NO3 (M – Na, K, Rb). The compositions of eutectic (mol%) Li,Na || I,NO3 : (E1 ) NaNO3 – 42,5%, NaI – 5,0%, LiNO3 – 52,5% with a melting point of 178 °C. Li,K || I,NO3 (E2 ) LiNO3 – 44,0%, KI – 2,0%, KNO3 – 54,0% (mol) with a melting point of 117°.

Phase diagram of the β-alanine – water binary system

Authors: Cherkasov D. G., Parfenova V. D.

The phase diagram of the β-alanine–water binary system was studied using the visual polythermal method and the method of time–temperature curves in а temperature range of -20–90°С. There is a eutectic equilibrium at -18.3°С in the system; the solid phases of this equilibrium are ice and individual β-alanine. For the first time, the composition of the liquid phase of the eutectic state was determined.

Density Calculation for Mixture Melts of LiF + NaF

Authors: Garkushin I. K., Lavrenteva O. V., Nikitina A. S., Andreeva Y. A.

Salt mixtures are used as molten electrolytes of chemical current sources, solvent melts of inorganic substances, heat storing compositions, fluxes for welding and soldering. Modern coolants include alkali metals and their halogenides. Lithium-containing thermofors have a special place. Density is one of the important properties of the melts used. The paper presents the analytical description of the density for the mixture melts of LiF + NaF of various compositions in the temperature range of 1130 ... 1320° K.

Quasi-binary Section Ag2SnS3-Sb2S3

Authors: Mamedov S. H.

Silver thiostannates and chalcostannates are widely used as promising functional materials which have semiconductor, thermoelectric, and photoelectric properties. The goal of this research is to study the Ag2SnS3-Sb2S3 phase diagram and determine the boundaries of solid solutions based on both components. Alloys were investigated using methods of physicochemical analysis. Based on the results of the study, a condition diagram of the Ag2SnS3-Sb2S3 system was constructed.

Research of Phase Equilibriums in a System of Dibasic Organic Acids: Azelaic, Glutaric and Sebacic

Authors: Kolyado A. V., Alenova S. M., Garkushin I. K.

Presented first the results of the research of phase equilibria of threecomponent system azelaic acid – glutaric acid – sebacic acid by used the microcalorimeter heat flow. Identified eutectic composition containing azelaic acid – 33,0 wt %, glutaric acid – 54,0 wt %, sebacic acid – 13,0 wt %. The melting temperature of the alloy eutectic composition in the three-component system is 70,5 °C, the specific enthalpy of melting is 82 ± 10 J./g.

Phase Equilibria in the Twocomponent System n-nonadecan – Cyclododecane

Authors: Petrov E. P., Garkushin I. K., Kolyado A. V.

Method of low-temperature differential thermal analysis using a differential scanning calorimeter of heat flow was first studied system n-nonadecane – cyclododecane. The studied systems are of the eutectic type. Alloy of eutectic composition contains 37,0 wt % of cyclododecane and melts at a temperature of 20.4 °C.

Phase Diagram of the Potassium Thiocyanate – Water Binary System

Authors: Il’in K. K., Cherkasov D. G.

The phase diagram of the potassium thiocyanate–water binary system was studied by the visual polythermal method and by the method of time–temperature curves over а temperature range – 35–180 оС. There is an eutectic equilibrium at –32.6 оС in the system; the solid phases of this equilibrium are ice and individual potassium thiocyanate. The composition of the liquid phase of the eutectic state was determined.

Study of the Stable Tetrahedron LiF-KF-KCl-K2WO4 of the Quinary Reciprocal System Li,K||F,Cl,WO4

Authors: Pichkaev О. V., Dvoryanova Е. М., Garkushin I. K.

The stable tetrahedron LiF-KF-KCl-K2WO4 of the quinary reciprocal system Li,K||F,Cl,WO4 was studied by differential thermal analysis, and the characteristics of eutectic and peritectic were determined.

ТРЕХКОМПОНЕНТНАЯ СИСТЕМА KCL–KBr–KVO3

Authors: Золотухина Е. В., Gubanova T. V., Garkushin I. K.
Методом дифференциального термического анализа (ДТА)
изучены фазовые равновесия в трехкомпонентной системе
KCl–KBr–KVO3, выявлен эвтектический состав (мол. %):
KCl 10.0%, KBr 10.0%, KVO3 80.0% с температурой плавления 467
°C. Разграничены поля кристаллизации фаз.