scholarly journals Thermodynamic study of phase equilibrium of superionic alloys of Ag3SBr1−xClx system in the concentration range 0.0–0.4 and temperature range 370–395 K

2017 ◽  
Vol 38 (1) ◽  
pp. 27-38
Author(s):  
M.V. Moroz ◽  
M.V. Prokhorenko ◽  
S.V. Prokhorenko ◽  
O.V. Reshetnyak
Keyword(s):  
Solid Solution ◽  
Thermodynamic Functions ◽  
Electromotive Force ◽  
Thermodynamic Assessment ◽  
Intermediate Phase ◽  
Equilibrium Phase ◽  
Electrochemical Cells ◽  
Partial Functions ◽  
Temperature Range ◽  
Electromotive Force Method

Abstract Thermodynamic assessment of the phase stability of the solid solutions of superionic alloys of the Ag3SBr1−xClx (I) system in the concentration range 0 ≤ x ≤ 0.4 and temperature range 370-395 K was performed. Partial functions of silver in the alloys of solid solution were used as the thermodynamic parameters. The values of partial thermodynamic functions were obtained with the use of the electromotive force method. Potential-forming processes were performed in electrochemical cells. Linear dependence of the electromotive force of cells on temperature was used to calculate the partial thermodynamic functions of silver in the alloys. The serpentine-like shape of the thermodynamic functions in the concentration range 0-4 is an evidence of the metastable state of solid solution. The equilibrium phase state of the alloys is predicted to feature the formation of the intermediate phase Ag3SBr0.76Cl0.24, and the solubility gap of the solid solution ranges of Ag3SBr0.76Cl0.24 and Ag3SBr.

scholarly journals Thermodynamic study of semiconducting related materials by use of EMF method with solid electrolyte

2003 ◽  
Vol 39 (3-4) ◽  
pp. 453-464 ◽  
Author(s):  
Iwao Katayama ◽  
Toshihiro Tanaka ◽  
Takamichi Iida
Keyword(s):  
Solid Solution ◽  
Solid Electrolyte ◽  
Thermodynamic Functions ◽  
Electromotive Force ◽  
Experimental Methods ◽  
Thermodynamic Study ◽  
Published Data ◽  
Emf Method ◽  
Force Method ◽  
Electromotive Force Method

Electromotive force method with solid electrolyte is briefly explained, and a thermodynamic study of semi conducting compound solid solution ZnTe-CdTe is picked up to show the way how thermodynamic functions of this system are obtained by several experimental methods based on our published papers and recently published data are added for comparison.

scholarly journals The Equilibrium Phase Formation and Thermodynamic Properties of Functional Tellurides in the Ag–Fe–Ge–Te System

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1314
Author(s):  
Mykola Moroz ◽  
Fiseha Tesfaye ◽  
Pavlo Demchenko ◽  
Myroslava Prokhorenko ◽  
Nataliya Yarema ◽  
...  
Keyword(s):  
Electromotive Force ◽  
Equilibrium Phase ◽  
Stoichiometric Composition ◽  
Negative Electrode ◽  
Electrochemical Cells ◽  
Thermodynamic Quantities ◽  
Positive Electrodes ◽  
Gibbs Energies ◽  
Buffer Region ◽  
First Time

Equilibrium phase formations below 600 K in the parts Ag2Te–FeTe2–F1.12Te–Ag2Te and Ag8GeTe6–GeTe–FeTe2–AgFeTe2–Ag8GeTe6 of the Fe–Ag–Ge–Te system were established by the electromotive force (EMF) method. The positions of 3- and 4-phase regions relative to the composition of silver were applied to express the potential reactions involving the AgFeTe2, Ag2FeTe2, and Ag2FeGeTe4 compounds. The equilibrium synthesis of the set of phases was performed inside positive electrodes (PE) of the electrochemical cells: (−)Graphite ‖LE‖ Fast Ag+ conducting solid-electrolyte ‖R[Ag+]‖PE‖ Graphite(+), where LE is the left (negative) electrode, and R[Ag+] is the buffer region for the diffusion of Ag+ ions into the PE. From the observed results, thermodynamic quantities of AgFeTe2, Ag2FeTe2, and Ag2FeGeTe4 were experimentally determined for the first time. The reliability of the division of the Ag2Te–FeTe2–F1.12Te–Ag2Te and Ag8GeTe6–GeTe–FeTe2–AgFeTe2–Ag8GeTe6 phase regions was confirmed by the calculated thermodynamic quantities of AgFeTe2, Ag2FeTe2, and Ag2FeGeTe4 in equilibrium with phases in the adjacent phase regions. Particularly, the calculated Gibbs energies of Ag2FeGeTe4 in two different adjacent 4-phase regions are consistent, which also indicates that it has stoichiometric composition.

scholarly journals Thermodynamic study of the thallium-thulium tellurides by EMF method

2021 ◽  
Vol 102 (2) ◽  
pp. 43-52
Author(s):  
S.Z. Imamaliyeva ◽  
◽  
I.F. Mekhdiyeva ◽  
Y.I. Jafarov ◽  
M.B. Babanly ◽  
...  
Keyword(s):  
Phase Equilibria ◽  
Thermodynamic Functions ◽  
Solid Phase ◽  
Electrochemical Cells ◽  
X Ray Diffraction ◽  
Partial Functions ◽  
Standard Thermodynamic Functions ◽  
Phase Equi ◽  
First Time ◽  
Thermodynamic Functions Of Formation

In this study the phase equilibria in the Tl2Te–Tl2Te3–TlTmTe2compositions area of the Tl–Tm–Te ternary system were studied by powder X-ray diffraction (PXRD) analysis. Based on PXRD data, the solid-phase equi-libria diagram was plotted. The thermodynamic functions of the Tl9TmTe6and TlTmTe2ternary compounds were calculated by the electromotive forces method. The electrochemical cells of the following type (−) TmТе (s.) | glycerol + KCl + TmCl3 | (Tm in alloys of Tl–Tm–Te system) (s.) (+) were assembled and their EMF were measured in the 300-450 Ktemperature range. Based on obtained EMF data for the Tl2Te3–TlTe–TlTmTe2and TlTe–TlTmTe2–Tl9TmTe6three-phase regions, the relative partial thermodynamic functions of TmTe in alloys were calculated. The combination of these functions with the partial molar functions of thulium in TmTe allowed calculating the corresponding partial functions of thulium in the above phase regions. The potential-forming reactions responsible for the indicated partial molar values were obtained based on con-structed solid-phase equilibria diagram. Using indicated potential-forming reactions, for the first time, the standard thermodynamic functions of formation and standard entropies of the Tl9TmTe6and TlTmTe2 compounds were calculated.

scholarly journals Thermodynamıc Propertıes of the BiTe and Bi8Te9 Compounds

2020 ◽  
Vol 21 (4) ◽  
pp. 714-719
Author(s):  
G.S. Hasanova ◽  
A.I. Aghazade ◽  
Y.A. Yusibov ◽  
M.B. Babanly
Keyword(s):  
Comparative Analysis ◽  
Thermodynamic Properties ◽  
Thermodynamic Functions ◽  
Partial Functions ◽  
Two Phase ◽  
Standard Thermodynamic Functions ◽  
Temperature Range ◽  
First Time ◽  
Thermodynamic Functions Of Formation

Two-phase alloys Bi8Te9+Bi4Te5 and BiTe+Bi8Te9 were studied by the electromotive forces method (EMF) in the temperature range 300-450 K. From the EMF data, the relative partial molar functions of bismuth in the alloys were calculated. The potential-forming reactions responsible for these partial functions were compiled, the values of the standard thermodynamic functions of formation, and the standard entropies of Bi8Te9 and BiTe compounds were calculated. A comparative analysis of the data for BiTe with the literature data was carried out; for Bi8Te9, the thermodynamic functions were obtained for the first time.

Electromotive force studies of liquid uranium–zinc alloys

1969 ◽  
Vol 47 (6) ◽  
pp. 965-969 ◽  
Author(s):  
Y. Hoshino ◽  
J. A. Plambeck
Keyword(s):  
Intermetallic Compound ◽  
Liquid Alloy ◽  
Thermodynamic Functions ◽  
Electromotive Force ◽  
Alloy Composition ◽  
Kcal Mole ◽  
Rich Region ◽  
Zinc Alloys ◽  
Temperature Range

The electromotive force of cells of the type U(s)/LiCl–KCl (eutectic) + UCl3/(U + Zn) (liquid alloy) have been measured over the temperature range 450–550 °C, in the zinc-rich region of alloy composition. Thermodynamic functions for the limiting uranium–zinc intermetallic compound existing in this region are: ΔGf0, −23.0 kcal/mole; ΔSf0, −37.1 cal/deg mole; ΔHf0, −52.9 kcal/mole at 535 °C. These values are compared with those previously reported by other workers.

scholarly journals THERMODYNAMIC PROPERTIES OF THE Sb2Te3 COMPOUND

2021 ◽  
Vol 0 (4) ◽  
pp. 53-59
Author(s):  
F.R. Aliyev ◽  
◽  
E.N. Orujlu ◽  
D.M. Babanly ◽  
◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Thermodynamic Properties ◽  
Thermodynamic Functions ◽  
Electromotive Force ◽  
Liquid Electrolyte ◽  
Emf Measurements ◽  
Temperature Range ◽  
First Time

Thermodynamic properties of the Sb2Te3 compound were studied by measuring electromotive force (EMF) with a liquid electrolyte in the temperature range of 300-450 K. The partial molar functions of antimony in alloys and the corresponding standard integral thermodynamic functions of the Sb2Te3 compound were calculated for the first time based on the EMF measurements under standard conditions. Comparative analysis of obtained results with literature data was carried out

PHASE EQUILIBRIUM IN THE AS2TE3-TM2TE3 SYSTEM.

2020 ◽  
Vol 5 (8(77)) ◽  
pp. 65-68
Author(s):  
Teymur Mammad Ilyasly ◽  
Rahman Hasanaga Fatullazade ◽  
Zakir Islam Ismailov ◽  
Nigar Nadir Jafarova
Keyword(s):  
Thermal Analysis ◽  
Solid Solution ◽  
Differential Thermal Analysis ◽  
Phase Equilibrium ◽  
Physicochemical Properties ◽  
Thermal Effects ◽  
Isothermal Annealing ◽  
Intermediate Phase ◽  
Physicochemical Analysis ◽  
Two Phases

The synthesis of alloys of the system was carried out stepwise in rotary furnaces. The synthesis mode was selected based on the physicochemical properties of the elementary components. For homogenization, the alloys were subjected to isothermal annealing at 750 and 1275 K, depending on the Tm2Te3 concentration, for 250 h after homogenization of the alloys, they were subjected to physicochemical analysis. The results of differential thermal analysis showed that reversible thermal effects are observed in the alloys of the system. In alloys in a 1: 1 ratio, a new intermediate phase is formed with a composition corresponding to the TmAsTe3 compound. The homogeneity area is observed in the concentration range 52.5-47.5. It was found that in the concentration range 98.5-52.5 Tm2Te3 there are two phases - a mixture of β and of the solid solution, and in the concentration range of 47.51 mol% Tm2Te3 phases and α are in equilibrium. ) 66 The eutectic has coordinates of 11.5 mol Tm2Te3 at a temperature of 575 K.

Ethanol conversion over Ga2O3-ZrO2 solid solution: empirical evidences of the reaction pathway, the surface acid–base property, and role of isolated gallium ion

2021 ◽  
Author(s):  
Takashi Yamamoto ◽  
Akihito Kurimoto ◽  
Riona Sato ◽  
Shoki Katada ◽  
Hirotaka Mine ◽  
...  
Keyword(s):  
Solid Solution ◽  
Reaction Pathway ◽  
Ethanol Conversion ◽  
Acid Base ◽  
Base Property ◽  
Temperature Range ◽  
Acid Base Property

Ethanol conversion by Ga2O3-ZrO2 solid solution was examined in the temperature range 573–773 K, and acetone/isobutene formation was confirmed under cofeeding of H2O vapor. The reaction pathway was empirically investigated...

Intermetallic Formation in the Aluminum–Copper System

2003 ◽  
Vol 10 (04) ◽  
pp. 677-683 ◽  
Author(s):  
E. B. Hannech ◽  
N. Lamoudi ◽  
N. Benslim ◽  
B. Makhloufi
Keyword(s):  
Electron Microscopy ◽  
Phase Diagram ◽  
Solid Solution ◽  
Intermetallic Layer ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Diffusion Couples ◽  
Intermetallic Formation ◽  
Parabolic Law ◽  
Scanning Electron

Intermetallic formation at 425°C in the aluminum–copper system has been studied by scanning electron microscopy using welded diffusion couples. Several Al–Cu phases predicted by the equilibrium phase diagram of the elements and voids taking place in the diffusion zone have been detected in the couples. The predominant phases were found to be Al 2 Cu 3 and the solid solution of Al in Cu, α. The growth of the intermetallic layer obeyed the parabolic law.

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