Experimental Study of the Tl4PbTe3-Tl9TbTe6-Tl9BiTe6 Section of the Tl-Pb-Bi-Tb-Te System

Imamaliyeva, S. Z.; Alakbarzade, G.I.; Gasymov, V. A.; Бабанлы, М. Б.

doi:10.1590/1980-5373-mr-2018-0189

Cited by 5 publications

(6 citation statements)

References 27 publications

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“…To equalize the number of atoms in the molecules, the thallium-lead-tellurium compound was taken as a dimer 2Tl 4 PbTe 3 . To modeling these systems, we used the experimental data of [38,40]. According to the results of the indicated papers, these cross sections are characterized by the formation of continuous solid solutions (δ-phase) with the Tl 5 Te 3 structure.…”

Section: Objects and Equations For Modelingmentioning

confidence: 99%

“…Due to the peculiarities of the crystal lattice, it has many ternary analogs of the types Tl 9 AX 6 and Tl 4 BX 3 (A -Sb, Bi, In, Au, rare-earth elements; B -Sn, Pb, Mo, Cu, rare-earth elements; X -Se, Te ) [15,[17][18][19][20][21][22][23], also possessing several functional properties, namely optical [24,25], thermoelectric [26][27][28][29], magnetic [30,31], as well as topological insulators properties [32,33]. In recent years, to improve thermoelectric performance, intensive work has been carried out to study solid solutions and doped phases based on these compounds [34][35][36][37] To obtain new variable composition phases with Tl 5 Te 3 -structure, we studied phase relations in a some systems consisting of Tl 5 Te 3 and its ternary analogs [38][39][40], in which continuous substitutional solid solutions were found. The constructed phase diagrams serve as the basis for choosing the composition of melts for growing single crystals of solid solutions of a given composition by the method of directional crystallization.…”

Section: Introductionmentioning

confidence: 99%

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MODELING THE PHASE DIAGRAM OF THE Tl9TbTe6–Tl4PbTe3–Tl9BiTe6 SYSTEM

Imamaliyeva¹,

Alakbarzade²,

Mamedov³

et al. 2021

AChJ

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The analytical multi 3D model of phase diagram of the Tl9TbTe6–Tl8Pb2Te6–Tl9BiTe6 system was obtained as temperature dependence on the composition using the Multipurpose Genetic Algorithm (MGA). It was determined that the system is characterized by the formation of continuous solid solutions with tetragonal Tl5Te3-type structure (δ-phase). The boundaries of the uncertainty band for the liquidus and solidus surfaces of the δ-phase and the TlTbTe2 compound are determined. The thermodynamic functions of mixing of the solid solutions depending on the composition and temperature are determined based on the model of regular solutions of non-molecular compounds. It was established that the δ-phase possess thermodynamic stability in the entire concentration interval

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Section: Objects and Equations For Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MODELING THE PHASE DIAGRAM OF THE Tl9TbTe6–Tl4PbTe3–Tl9BiTe6 SYSTEM

Imamaliyeva¹,

Alakbarzade²,

Mamedov³

et al. 2021

AChJ

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“…Данная работа является продолжением наших исследований по фазовым равновесиям в системах на основе теллуридов таллия-РЗЭ, в которых выявлены широкие поля твердых растворов со структурой Tl 5 Te 3 и которые представляют практический интерес как термоэлектрические материалы с аномально низкой теплопроводностью [32][33][34][35][36].…”

Section: Introductionunclassified

“…Исходные соединения и фазовые равновесия в граничных системах изучены довольно подробно [33,[37][38][39][40][41][42][43].…”

Section: Introductionunclassified

Phase relations in the Tl2 Te–TlBiТe2 –TlTbTe2 system

Imamaliyeva

Alakbarzade

Бабанлы

et al. 2021

kcmf

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The phase equilibria in the Tl2Te–TlBiТe2–TlTbTe2 concentration area of the Tl–Bi–Tb-Te quaternary system were investigated by using the differential thermal analysis and powder X-ray diffraction techniques. The diagram of the solid-phase equilibria of this system at room temperature was constructed. It was established that the Tl9BiTe6–Tl9TbTe6 section divides the Tl2Te–TlBiТe2–TlTbTe2 system into two independent subsystems. It was found that the Tl2Te–Tl9BiTe6–Tl9TbTe6 subsystem is characterized by the formation of a wide field of solid solutions with a Tl5Te3 structure (δ-phase) that occupy more than 90% of the area of the concentration triangle. The results of X-ray phase analysis of alloys of the Tl9BiTe6–Tl9TbTe6–TlTbTe2–TlBiТe2 subsystem showed the formation of wide regions of solid solutions based on TlTbTe2 and TlBiTe2 along the section of TlTbTe2–TlBiTe2 ((β1- and β2-phases) and made it possible to determine the location of the heterogeneous phase regions in this subsystem. The parameters of crystal lattices of mutually saturated compositions of the β1-, β2-, and δ-phases are calculated from powder diffraction patterns.The paper also presents some polythermal sections, isothermal sections at 740 and 780 K of the phase diagram, as well as projections of the liquidus and solidus surfaces of the Tl2Te–Tl9BiТe6–Tl9TbTe6 subsystem. The liquidus surface consists of three fields of the primary crystallization of α (Tl2Te)-, δ- and β1-phase. The constructed isothermal sections clearly demonstrate that the directions of the tie lines do not coincide with the T–x planes of the studied internal sections, which is characteristic of non-quasi-binary polythermal sections. The obtained new phases are of interest as potential thermoelectric and magnetic materials.

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“…In order to obtain new phases of variable composition with a structure of the Tl 5 Te 3 type, we studied phase equilibria in a number of systems consisting of Tl 5 Te 3 and its ternary analogs [27][28][29], in which continuous substitutional solid solutions were revealed. The constructed phase diagrams serve as the basis for choosing the composition of melts for growing single crystals of solid solutions with a given composition by directional crystallization.…”

Section: Introductionmentioning

confidence: 99%

MODELING THE PHASE DIAGRAMS OF THE Tl9SmTe6–Tl4PbTe3 AND Tl9SmTe6–Tl9BiTe6 SYSTEMS

Imamaliyeva¹,

Alakbarzade²,

Mamedov³

et al. 2020

AChJ

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Using the multipurpose genetic algorithm, the analytical models of phase diagrams of the Tl9SmTe6–Tl8Pb2Te6 and Tl9SmTe6–Tl9BiTe6 systems as temperature dependencies of compositions of the equilibrium phases were obtained. The boundaries of the uncertainty band for the liquidus and solidus curves of solid solutions are determined. According to the model of regular solutions of non-molecular compounds, the thermodynamic functions of mixing solid solutions depending on the composition and temperature are determined. It was found that solid solutions based on the Tl9SmTe6, Tl8Pb2Te6 and Tl9BiTe6 compounds are thermodynamically stabile in the whole concentration range

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Experimental Study of the Tl4PbTe3-Tl9TbTe6-Tl9BiTe6 Section of the Tl-Pb-Bi-Tb-Te System

Cited by 5 publications

References 27 publications

MODELING THE PHASE DIAGRAM OF THE Tl9TbTe6–Tl4PbTe3–Tl9BiTe6 SYSTEM

MODELING THE PHASE DIAGRAM OF THE Tl9TbTe6–Tl4PbTe3–Tl9BiTe6 SYSTEM

Phase relations in the Tl2 Te–TlBiТe2 –TlTbTe2 system

MODELING THE PHASE DIAGRAMS OF THE Tl9SmTe6–Tl4PbTe3 AND Tl9SmTe6–Tl9BiTe6 SYSTEMS

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