scholarly journals ФИЗИКО-ХИМИЧЕСКОЕ ИССЛЕДОВАНИЕ СИСТЕМЫ SB2SE3- CU2CR4TE7

2021 ◽  
Vol 7 (7(61)) ◽  
pp. 34-37
Author(s):  
Имир Ильяс Алиев ◽  
Эльман Идрис Мамедов ◽  
Фахраддин Вели Юсубов ◽  
Ламан Фахири Масиева
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Solid State ◽  
Solid Solutions ◽  
State Diagram ◽  
Physicochemical Analysis ◽  
The State ◽  
Density Determination

Методами физико-химического анализа (ДТА, РФА, МСА, а также определением плотности и измерением микротвердости) исследованы системы Sb2Se3-Cu2Cr4Te7 и построена фазовая диаграмма. По данным предварительного термического анализа сплавов системы показало, что в системе обнаружены два и три эндотермические эффекты. Установлено, что диаграмма состояния системы частично квазибинарная. В системе Sb2Se3-Cu2Cr4Te7 на основе исходных компонентов обнаружены области твердых растворов. Установлено, что при твердом состоянии твердые растворы на основе Sb2Se3 простирается до 4 мол. % Cu2Cr4Te7, а на основе Cu2Cr4Te7 до-15 мол. % Sb2Se3. Исследована зависимость микротвердости и плотности сплавов системы от состава. The Sb2Se3-Cu2Cr4Te7 systems were investigated by the methods of physicochemical analysis (DTA, XRD, MSA, as well as density determination and microhardness measurements) and a phase diagram was constructed. According to the preliminary thermal analysis of the alloys of the system, it has shown that two and three endothermic effects are found in the system. It was found that the state diagram of the system is partially quasi-binary. In the Sb2Se3-Cu2Cr4Te7 system on the basis of the initial components, regions of solid solutions have been found. It was found that, in the solid state, solid solutions based on Sb2Se3 extend to 4 mol. % Cu2Cr4Te7, and on the basis of Cu2Cr4Te7 up to -15 mol. % Sb2Se3. The dependence of the microhardness and density of the alloys of the system on the composition has been investigated.

Thermochemische Untersuchungen zu den Systemen SE2O3-SeO2. V. Ytterbiumselenoxide auf dem Schnitt Yb2O3-SeO2/Thermochemical Investigations of Systems RE2O3-SeO2. V. Ytterbium Selenium Oxides on the Line Yb2O3-SeO2

2002 ◽  
Vol 57 (8) ◽  
pp. 868-876 ◽  
Author(s):  
H. Oppermann ◽  
M. Zhang-Preße ◽  
P. Schmidt
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Solid State ◽  
Ir Spectroscopy ◽  
Powder Diffraction ◽  
Solid State Reaction ◽  
Total Pressure ◽  
Pressure Measurements ◽  
Thermodynamical Equilibrium ◽  
X Ray

The pure ternary phases on the line Yb2O3-SeO2 in thermodynamical equilibrium have been synthesized by solid state reaction and characterized using X-ray powder diffraction and IR-spectroscopy. There exist three phases: Yb2SeO5, Yb2Se3O9 and Yb2Se4O11, the last one with a homogeneiety range extending a higher SeO2-content. The thermal decompositions have been determined by total pressure measurements, and the thermodynamical data of the compounds have been derived. The phase diagram and the phase barogram have been established using the results of thermal analysis and total pressure measurements.

scholarly journals Thermodynamics of formation and evaporation of lead-tin alloys

2021 ◽  
Vol 316 (1) ◽  
pp. 82-90
Author(s):  
S. A. Trebukhov ◽  
◽  
V. N. Volodin ◽  
O. V. Ulanova ◽  
A. V. Nitsenko ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Vapor Phase ◽  
Volatile Component ◽  
State Diagram ◽  
Thermodynamic Activity ◽  
The State ◽  
Volatile Components ◽  
Entire Concentration Range ◽  
Tin Alloys ◽  
Physicochemical Data

Only a few works have been devoted to thermodynamic studies of the lead-tin system by methods including the volatile components evaporation process. When the binary system is separated into metals by distillation, the volatile component is removed from the alloy and the low-volatile component accumulates in the bottom products, that is, there are alloy composition changes over the entire concentration range. It is necessary to know the boundaries position of the melt and vapor coexistence fields on the state diagram, especially for solutions beneficiated with non-volatile metal to assess the quality of the vapor phase by the content of the low-volatile component. In this regard, the study has been completed with the purpose to clarify the values of the thermodynamic functions of the formation and evaporation of lead-tin melts required to calculate the boundaries of the liquid and vapor coexistence fields on the state diagram that enables us to judge the amount of a low-volatile component in the vapor phase under equilibrium conditions. The thermodynamic activity of lead was calculated, as well as the numerical integration of the Gibbs-Duhem equation using the substitution proposed by Darken is the thermodynamic activity and pressure of saturated tin vapor Based on the values of the saturated lead vapor pressure, determined by the boiling point method (isothermal version) for alloys predominantly of the lead edge of the phase diagram. The thermodynamic constants thus obtained will add to the base of physicochemical data and will be used to calculate the boundaries of the vapor-liquid equilibrium fields on the phase diagram, allowing to determine the possibility and completeness of the distillation separation of metals.

scholarly journals QUASIBINAR SECTION OF AgGaS2-AgSbS2

2020 ◽  
Vol 63 (10) ◽  
pp. 11-16
Author(s):  
Rana A. Ismailova ◽  
Soltan G. Aliyev ◽  
Gulnara N. Abdullaeva ◽  
Almaz G. Gurbanova ◽  
Mehpara Yu. Sadigova ◽  
...  
Keyword(s):  
Single Crystals ◽  
Solid Solutions ◽  
State Diagram ◽  
Lattice Parameter ◽  
Physicochemical Analysis ◽  
Optical Measurements ◽  
Study Phase ◽  
Eutectic Type ◽  
Study Phase Equilibrium ◽  
Stockbarger Method

The aim of this work is to study phase equilibrium and build a state diagram of the AgGaS2-AgSbS2 system. For research, the initial sulfides (AgGaS2 and AgSbS2) were synthesized from elements of high purity in quartz ampoules evacuated to 0.133 Pa. Quaternary alloys of the AgGaS2 – AgSbS2 systems were synthesized from ligatures at a temperature of 800–1300 K, depending on the composition. To homogenize the alloys, annealing was performed at 50–60 K below solidus for 300 h. Using complex methods of physicochemical analysis (differential thermal, X-ray phase, microstructural, microhardness measurement and density determination), phase equilibria in the AgGaS2-AgSbS2 system were studied. It was established that the AgGaS2-AgSbS2 system is a quasibinary section of the eutectic type and its state diagram is constructed. The coordinates of the eutectic correspond to 65 mol. % AgSbS2 and a temperature of 750 K. Based on the starting components in the section, the regions of solid solutions were determined. At room temperature, the regions of solid solutions based on AgGaS2 (8 mol. % AgSbS2) and based on AgSbS2 (14 mol. % AgGaS2) were revealed. At a eutectic temperature, solubility reaches 20 and 25 mol. %, respectively. According to the XRD data, α-solid solutions belong to monoclinic syngony, and with an increase in the concentration of AgGaS2, the lattice parameter increases (a = 12.861-12.972; b = 4.409-4.474; c = 13.282-13.324Å). AgSbS2 triple sulfide solid solutions crystallize in monoclinic syngony. These solid solutions are of the type of substitution. For structural and optical measurements, technological conditions for the growth of crystals of solid solutions were developed and their single crystals were grown. Single crystals of (AgSbS2)1-x(AgGaS2)x solid solutions were obtained by the Bridgman-Stockbarger method.

scholarly journals STUDY OF THE CU3AS4TE9-CRASTE3 SECTION OF THE AS2Te3-Cr2Te3-CuTe quasi-ternary system

2021 ◽  
pp. 40-44
Author(s):  
S. Ismailova
Keyword(s):  
Phase Diagram ◽  
Solid Solution ◽  
Ternary System ◽  
Solid Solutions ◽  
Room Temperature ◽  
Physicochemical Analysis ◽  
Binary Section ◽  
Quasi Binary Section ◽  
Quasi Ternary System

Chemical interactions in the system were studied by methods of physicochemical analysis (DTA, XRD, MSA, determination of density and microhardness) and its phase diagram was constructed. It was found that the phase diagram of the system is a non-quasi-binary section of the quasi-ternary system As2Te3-Cr2Te3-CuTe. At room temperature in the system of solid solutions based on Cu3As4Te9 reaches - 5 mol. % CrAsTe3. The region of the solid solution based on the CrAsTe3 compound has not been established in practice. The dependence of the microhardness and density of alloys of the Cu3As4Te9-CrAsTe3 system on the composition has been investigated.

Thermal analysis of germanium(II) sulfide

1968 ◽  
Vol 46 (14) ◽  
pp. 2464-2468 ◽  
Author(s):  
L. Ross ◽  
M. Bourgon
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
Solid State ◽  
State Transition ◽  
S Phase ◽  
Solid State Transition

Germanium(II) sulfide has been studied by the technique of differential thermal analysis. The results show that the reported Ge—S phase diagram may be in error: no evidence has been found for a solid-state transition at 590 °C and GeS appears to undergo peritectic disproportionation at approximately 650 °C.

scholarly journals THE Bi2S3 – YbS SYSTEM

2021 ◽  
Vol 19 (3) ◽  
pp. 168-172
Author(s):  
O.M. Aliyev ◽  
◽  
T.F. Maksudova ◽  
D.S. Azhdarova ◽  
Sh.G. Mamedov ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Ternary System ◽  
Cross Section ◽  
Solid Solutions ◽  
State Diagram ◽  
Physicochemical Analysis ◽  
Micro Hardness ◽  
Ternary Compounds

The phase equilibrium in the Bi2S3 – YbS system was studied by the methods of physicochemical analysis – DTA, XRD, MSA through measuring the micro-hardness and density, and a state diagram was plotted. It has been found that this system is a quasi-binary cross-section of the Yb-Bi-S ternary system. The formation of the two ternary compounds with YbBi2S4 and YbBi4S7 compositions was detected and the areas of solid solutions determined.

scholarly journals RESEARCH CHEMICAL INTERACTIONS IN THE CuTe–As2Te3 SYSTEM

2021 ◽  
pp. 67-71
Author(s):  
I.I. Aliev ◽  
◽  
S.Sh. Ismailova ◽  
M.H. Shakhbazov ◽  
◽  
...  
Keyword(s):  
Phase Diagram ◽  
Phase Analysis ◽  
Solid Solutions ◽  
Chemical Compound ◽  
Eutectic Composition ◽  
State Diagram ◽  
Eutectic Type ◽  
System State ◽  
Chemical Interactions ◽  
X Ray

By the methods of DTA, XRD, MSA, as well as by measuring the microhardness and determining the density of the alloys, the CuTe–As2Te3 system was studied and a phase diagram was constructed. The system state diagram is of the eutectic type and it is characterized by one chemical compound of Cu3As4Te9 composition. Compounds Cu3As4Te9 melts incongruently at 3200C. Solid solutions based on As2Te3 reaches 8 mol %, and based on CuTe solid solutions are practically not installed. Cu3As4Te9 and As2Te3 form an eutectic composition of 45 mol % As2Te3 and temperature 2650C. The results of X-ray phase analysis have shown that the Сu3As4Te9 compounds is crystallized in the tetragonal syngony with lattice parameters: a = 13.86, c = 18.05 Å, Z = 9, ρpyk. = 6.96 g/cm3, ρrent. = 7.06 g/cm3

scholarly journals PHASE DIAGRAM OF THE PB-MNSE SYSTEM

2021 ◽  
pp. 44-48
Author(s):  
T. Kurbanova
Keyword(s):  
Phase Diagram ◽  
Phase Equilibrium ◽  
Cross Section ◽  
Solid Solutions ◽  
Room Temperature ◽  
Eutectic Composition ◽  
State Diagram ◽  
Eutectic Type ◽  
Definition Of ◽  
Physical And Chemical

Methods of physical and chemical analysis (DTA, MSA, RFA, as well as the definition of microhardness and density) studied the phase equilibrium in the system Pb-MnSe and built its state diagram. It is established that the Pb-MnSe system is a quasi-binary cross-section of the triple system Mn-Pb-Se and is of the eutectic type. The components Pb and MnSe form between the degenerate eutectic composition, which corresponds to 3 mol. % MnSe and melts at 310 ° C. It was found that solid solutions on the basis of MnSe in the system at room temperature reach 3.5 mol. % Pb, and solid solutions on the basis of Pb is practically not installed.

scholarly journals Investigation of Bi2O3-rich part of Bi2O3-PbO phase diagram

2017 ◽  
Vol 82 (12) ◽  
pp. 1433-1444
Author(s):  
Aleksandra Dapcevic ◽  
Dejan Poleti ◽  
Ljiljana Karanovic ◽  
Jelena Miladinovic
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
High Temperature ◽  
Phase Diagrams ◽  
Powder Diffraction ◽  
Solid Solutions ◽  
Large Field ◽  
X Ray ◽  
Crucial Difference

A new Bi-rich part of Bi2O3?PbO phase diagram was determined using differential thermal analysis and X-ray powder diffraction techniques. Four solid solutions, ?-Bi2O3, ?-Bi2O3, ?-Bi2O3 and ?ss-Bi8Pb5O17, can be distinguished below 37.5 mol % of PbO and one compound, ?2-Bi8Pb5O17. Two of them, ?-Bi2O3 and ?ss-Bi8Pb5O17 are high-temperature phases. The large field of ?-Bi2O3 stability was implemented making the crucial difference comparing to phase diagrams from the Bi2O3?PbO system published so far.

ФИЗИКО-ХИМИЧЕСКОЕ ИССЛЕДОВАНИЕ СИСТЕМЫ Bi2Te3-Ho2Тe3

2020 ◽  
Vol 3 (11(80)) ◽  
pp. 57-62
Author(s):  
F. Sadygov ◽  
N. Mamedova
Keyword(s):  
Phase Analysis ◽  
Solid Solutions ◽  
State Diagram ◽  
Physicochemical Analysis ◽  
Eutectic Type ◽  
System State ◽  
X Ray ◽  
Tetragonal System ◽  
Binary Eutectic ◽  
Ratio Of Components

The chemical interactions in the Bi2Te3-Ho2Te3 system are investigated by methods of physicochemical analysis (DTA, XRD, MSA, microhardness measurements and density determination), a state diagram is constructed. As a result, it was revealed that the system state diagram is a quasi-binary eutectic type. In the Bi2Te3Ho2Te3 system, in a 1: 1 ratio of components, one ternary compound of the HoBiTe3 composition, incongruently melting at 610°C, is formed. According to the results of X-ray phase analysis, it was found that the HoBiTe3 compound crystallizes in the tetragonal system with lattice parameters: a = 19.99; c = 13.82 Å, Z = 3, density ρpikn. = 7.30 g/cm3 ρrent. = 7.35 g/cm3.On the basis of the initial components, regions of solid solutions were found, which on the basis of Bi2Te3 reach 5 mol % Ho2Te3, and on the basis of Ho2Te3 -3 mol % Bi2Te3. Compounds Bi2Te3 and Ho2Te3 form a eutectic with a composition of 20 mol % Ho2Te3 and a temperature of 465°C.

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