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.

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.

Determination of Zinc Sulfide and Cadmium Sulfide in Solid Solutions of Small Single Crystals Used for Semiconductors by X-Ray and Chemical Methods

1961 ◽  
Vol 5 ◽  
pp. 142-152
Author(s):  
Frank L. Chan
Keyword(s):  
Cadmium Sulfide ◽  
Single Crystals ◽  
Zinc Sulfide ◽  
Solid Solutions ◽  
Lattice Parameter ◽  
Chemical Methods ◽  
Pure Zinc ◽  
X Ray ◽  
Mixed Sulfides

AbstractSingle crystals of cadmium sulfide and zinc sulfide have been grown and studied intensively by the Solid State Physics group at the Aeronautical Research Laboratory. The physical phenomena such as reflection, transmission, ultraviolet-excited emission, and electrical resistivity have been observed and characterized on single crystals of these sulfides. Much interest concerning these phenomena has also been centered on single crystals containing both cadmium sulfide and zinc sulfide.For research purposes, mixed crystals as small as a few tenths of 1 mg or less, to 0.5 g of the mixed sulfides, are being prepared. Special chemical methods are required to determine these constituents in them quantitatively. At times, these chemical methods are not applicable, since these methods invariably consume the sample, and, as a result, other observations on the same crystals cannot be performed.Changes in lattice parameter in single crystals of mixed sulfides as compared to pure zinc sulfide or cadmium sulfide provide excellent means for the determination of the percentage of these sulfides. In the X-ray method, single crystals used for the determination of the lattice parameters remain intact. The equipment adopted, procedure used, and the data obtained are illustrated and discussed.In the present study, crystals of cadmium sulfide (greenockite), alpha-zinc sulfide (wurtzite) and solid solutions of these two sulfides having a hexagonal unit cell were used. Since the lattice parameter a0 is found to follow Vegard's law, single-crystal rotation photographs described in this paper were obtained by rotating crystals around the c axis; the lattice parameter was determined with high precision by scanning along the zero-layer line with a microphotometer.

scholarly journals PHASE EQUILIBRIUM AND GLASS FORMATION IN THE AS2SE3-CUCR2TE4 SYSTEM

2020 ◽  
Vol 3 (2(71)) ◽  
pp. 47-50
Author(s):  
I.I. Aliev ◽  
S. Sh. Ismailova ◽  
Dzh.A. Ahmedova ◽  
S.T. Mehtieva
Keyword(s):  
Solid Solutions ◽  
Glass Formation ◽  
Optical Materials ◽  
Eutectic Point ◽  
State Diagram ◽  
Eutectic Type ◽  
Glass Formation Region ◽  
Slow Cooling ◽  
Binary Eutectic ◽  
Theoretical Foundations

Studies of the interaction of As2Se3 with CuCr2Te4 chalcogenides are of interest both for the development of the general theoretical foundations of this type of process and for the creation of magnetic and magneto-optical materials. To clarify the nature of the physicochemical properties, the As2Se3-CuCr2Te4 system was investigated. The results of a physicochemical study of the As2Se3-CuCr2Te4 system found that the state diagram of the system is quasi-binary eutectic type. In the system near the initial components, a narrow homogeneous region was revealed. At room temperature, solid solutions based on As2Se3 extend to 2 mol %, and on a CuCr2Te4 basis, solid solutions reach 6 mol. % .The joint crystallization of As2Se3 and CuCr2Te4 ends at the double eutectic point. Upon slow cooling in the As2Se3-CuCr2Te4 system based on As2Se3, the glass formation region reaches 10 mol. % CuCr2Te4.

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.

Crystallography and temperature dependance of the resistivity of SnS2−xSex solid solutions

1978 ◽  
Vol 56 (9) ◽  
pp. 1136-1139 ◽  
Author(s):  
J. Y. Harbec ◽  
Y. Paquet ◽  
S. Jandl
Keyword(s):  
Single Crystals ◽  
Solid Solutions ◽  
Transport Process ◽  
Lattice Parameter ◽  
Resistivity Variation ◽  
Iodine Transport ◽  
Temperature Dependance

The iodine transport process was used to grow single crystals of SnS2−xSex with 0 ≤ x ≤ 2 Platelike crystals with dimensions of the order of 10 mm × 10 mm × 10−2 mm were obtained and their compositions were chemically analyzed. Measurements of lattice parameter and resistivity variation as a function of composition x were carried out.

scholarly journals SYNTHESIS OF ALLOYS OF THE Sb2Se3-CuCr2Te4 SYSTEM AND PHYSICO-CHEMICAL PROPERTIES

2021 ◽  
pp. 49-53
Author(s):  
E. Mamedov ◽  
I. Aliev ◽  
L. Masieva
Keyword(s):  
Solid Solutions ◽  
Single Phase ◽  
Chemical Properties ◽  
Physicochemical Analysis ◽  
Eutectic Type ◽  
X Ray ◽  
Physico Chemical ◽  
Phase Fields ◽  
Binary Eutectic ◽  
Quasi Ternary System

The interaction in the quasi-ternary system Sb2Se3-CuTe-Cr2Te3 along the Sb2Se3-CuCr2Te4 section was studied by methods of physicochemical analysis: differential thermal (DTA), X-ray phase (XRD), microstructure (MSA), as well as by measuring the density and its microhardness and plotted. The phase diagram of the system is quasi-binary, eutectic type. The composition of the double eutectic formed in the system is 20 mol % CuCr2Te4 and a temperature of 490°C. As a result of the analysis of the microstructure, it was determined that there are single-phase fields based on the original components. It was found that at room temperature, solid solutions based on Sb2Se3 extend to 5 mol % CuCr2Te4, and on the basis of CuCr2Te4 solid solutions reach 13 mol % Sb2Se3.

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.

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