scholarly journals THERMODYNAMIC FUNCTIONS OF FORMATION OF LITHIUM TITANATES

2021 ◽  
Vol 0 (4) ◽  
pp. 60-66
Author(s):  
U.N. Sharifova ◽  
Keyword(s):  
Free Energy ◽  
Enthalpy Of Formation ◽  
Thermodynamic Functions ◽  
Standard Entropy ◽  
Standard State ◽  
Temperature Range ◽  
Lithium Glass ◽  
Binary Compounds ◽  
First Time ◽  
Thermodynamic Functions Of Formation

By the method of electromotive forces measuring concentration chains: Pt│Li2O│ ZrO2+10 wt% Y2O3, lithium glass. (Li2O)x(TiO2)1-x│Pt in the temperature range T=1000–1200K and concentrations 0.35÷0.95 mol fraction TiO2, the thermodynamic functions of the formation of the compounds Li4TiO4, Li2TiO3, Li4Ti5O12 and phases based on Li2TiO3:Li1.92Ti1.04O3.04, Li2.12Ti0.94O2.92 were determined. With the exception of the compound Li2TiO3, the thermodynamic functions of the formation of lithium titanates are deter¬mined for the first time. The thermodynamic functions of formation are calculated for the 1200 K and for the standard state at 298 K. The thermodynamic functions of the formation of lithium titanates are determined from simple substances and from binary compounds Li2O and TiO2. In particular, for the free energy, enthalpy of formation and standard entropy we obtained: ∆G_298^0(Li4TiO4)=–2149 kJ∙mol-1; ∆G_298^0(Li2TiO3)=–1565; ∆G_298^0(Li4Ti5O12)=–5923; ∆H_298^0(Li4TiO4)=–2286 kJ∙mol-1; ∆H_298^0(Li2TiO3)=–1662; ∆H_298^0(Li4Ti5O12)=–6287; S_298^0(Li4TiO4)=119.1 J∙mol-1∙K-1; S_298^0(Li2TiO3)=84; S_298^0(Li4Ti5O12)=315.7

scholarly journals Thermodynamic study of a synthetic analog of the famatinite mineral - Cu3SbS4

2021 ◽  
Vol 22 (1) ◽  
pp. 53-58
Author(s):  
P.R. Mammadli ◽  
L.F. Mashadiyeva ◽  
Z.T. Hasanova ◽  
D.M. Babanly
Keyword(s):  
Thermodynamic Functions ◽  
Measurement Data ◽  
Phase Region ◽  
S Phase ◽  
Synthetic Analog ◽  
Standard Entropy ◽  
Emf Measurements ◽  
Standard Thermodynamic Functions ◽  
First Time ◽  
Thermodynamic Functions Of Formation

Fundamental thermodynamic properties of the synthetic analog of the famatinite mineral - Cu3SbS4 were studied on the basis of electromotive force (EMF) measurements. The EMF of the concentration chains relative to the Cu electrode with a solid electrolyte was measured for the alloys from the Cu3SbS4 + Sb2S3 + S phase region at 300-380K temperature interval. Based on measurement data, the relative partial thermodynamic functions of copper in alloys, the standard thermodynamic functions of formation, as well as, the standard entropy of the Cu3SbS4 ternary compound were calculated for the first time.

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.

scholarly journals Thermodynamic properties of the GdTe3 compound

2021 ◽  
Vol 22 (3) ◽  
pp. 420-425
Author(s):  
Samira Imamaliyeva
Keyword(s):  
Thermodynamic Properties ◽  
Thermodynamic Functions ◽  
Standard Entropy ◽  
X Ray Diffraction ◽  
Emf Measurements ◽  
Standard Thermodynamic Functions ◽  
X Ray ◽  
Temperature Range ◽  
Concentration Cells ◽  
Thermodynamic Functions Of Formation

The alloys of the Gd-Te system in the range of compositions > 75 at% Te were studied by the methods of X-ray diffraction (XRD) and electromotive forces (EMF). From the EMF measurements of the concentration cells relative to the GdTe electrode in the 300-450 K temperature range, the partial thermodynamic functions of GdTe in alloys were determined. By combining these data with the corresponding functions of Gd in GdTe, the partial molar functions of gadolinium in GdTe3+Te alloys, and standard thermodynamic functions of formation and standard entropy of the GdTe3 compound were calculated. The obtained results were compared with the literature data.

Electrochemical and thermodynamic properties of U4+ and U3+ on Mo electrode in LiCl-KCl eutectic

2019 ◽  
Vol 107 (2) ◽  
pp. 95-104
Author(s):  
Ru-Shan Lin ◽  
You-Qun Wang ◽  
Zhao-Kai Meng ◽  
Hui Chen ◽  
Yan-Hong Jia ◽  
...  
Keyword(s):  
Free Energy ◽  
Thermodynamic Properties ◽  
Thermodynamic Functions ◽  
Electrochemical Behavior ◽  
Diffusion Coefficients ◽  
Electrochemical Techniques ◽  
Reduction Process ◽  
Standard Potential ◽  
Hcl Gas ◽  
Thermodynamic Functions Of Formation

Abstract In this study, UCl4 was prepared by the reaction of HCl gas with UO2 in the LiCl-KCl eutectic. Then, the electrochemical behavior of U4+ and U3+ on a Mo cathode was investigated by various electrochemical techniques. The reduction process of U4+ was regarded as two steps: U4++e=U3+; U3++3e=U. Diffusion coefficients of U4+ and U3+, the apparent standard potential of U4+/U3+, U3+/U as well as U4+/U in the LiCl-KCl molten salt on the Mo electrode was determined by numerous electrochemical methods. The thermodynamic functions of formation of Gibbs free energy of UCl4 and UCl3 are calculated as well.

scholarly journals The Physical and Thermodynamic Functions of Borides

2017 ◽  
Vol 18 (1) ◽  
pp. 58-63
Author(s):  
N.Yu. Filonenko
Keyword(s):  
Free Energy ◽  
Physical Properties ◽  
Thermodynamic Functions ◽  
Point Of View ◽  
Energy Potential ◽  
High Temperature Expansion ◽  
Temperature Dependences ◽  
Function Calculation ◽  
First Time ◽  
Good Agreement

In the paper the physical properties and thermodynamic functions of borides Х2В (Х=W, Mo, Mn, Fe, Co, Ni та Cr) are studied with accounting for fluctuation processes. We use the microstructure analysis, the X-ray structural and the durometric analyses to determine the physical properties of alloys. In the paper it is determined the phase composition and physical properties of borides. In this paper for the first time it is determined the thermodynamic functions of borides using the Hillert and Staffansson model with accounting for the first degree approximation of high-temperature expansion for the free energy potential of binary alloys. We obtain the temperature dependences for such thermodynamic functions as Gibbs free energy, entropy, enthalpy and heat capacity Ср along with their values at the formation temperature for Х2В (Х=W, Mo, Mn, Fe, Co, Ni та Cr). The approach under consideration enables to give more thorough from the thermodynamic point of view description of borides formed from the liquid. The outcomes of the thermodynamic function calculation for borides are in good agreement with experimental data and results of other authors.

Heat Capacity and Thermodynamic Properties of LaBr3 at 300 – 1100 K

2004 ◽  
Vol 59 (11) ◽  
pp. 825-828
Author(s):  
L. Rycerz ◽  
E. Ingier-Stocka ◽  
B. Ziolek ◽  
S. Gadzuric ◽  
M. Gaune-Escard
Keyword(s):  
Differential Scanning Calorimetry ◽  
Heat Capacity ◽  
Thermodynamic Properties ◽  
Temperature Dependence ◽  
Enthalpy Of Formation ◽  
Thermodynamic Functions ◽  
Molar Enthalpy ◽  
Standard Molar Enthalpy ◽  
Scanning Calorimetry ◽  
Temperature Range

The heat capacity of solid and liquid LaBr3 was measured by Differential Scanning Calorimetry (DSC) in the temperature range 300 - 1100 K. The obtained results were fitted by a polynomial temperature dependence. The enthalpy of fusion of LaBr3 was also measured. By combination of these results with the literature data on the entropy, S0m (LaBr3, s, 298.15 K) and the standard molar enthalpy of formation, ΔformH0m (LaBr3, s, 298.15 K), the thermodynamic functions of lanthanum tribromide were calculated up to 1300 K

scholarly journals Heat Capacities and Thermodynamic Properties of Pinnoite and Inderite

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Hanyu Zheng ◽  
Kangrui Sun ◽  
Long Li ◽  
Yafei Guo ◽  
Tianlong Deng
Keyword(s):  
Free Energy ◽  
Phase Transitions ◽  
Thermodynamic Properties ◽  
Gibbs Free Energy ◽  
Thermodynamic Functions ◽  
High Purity ◽  
Heat Capacities ◽  
Thermal Anomalies ◽  
Natural Minerals ◽  
First Time

In this paper, in order to understand the thermodynamic properties of natural minerals of pinnoite (MgB2O4·3H2O, Pin) and inderite (Mg2B6O11·15H2O, Ind) deposited in salt lakes, heat capacities of two minerals were measured using a precision calorimeter at temperatures from 306.15 to 355.15 K after the high purity was synthesized. It was found that there are no phase transitions and thermal anomalies for the two minerals, and the molar heat capacities against temperature for Pin and Ind were fitted as Cp,m,pin = −2029.47058 + 16.94666T − 0.04396T2 + 3.89409×10−5T3 and Cp,m,Ind = −30814.43795 + 282.68108T − 0.85605T2 + 8.70708×10−4T 3, respectively. On the basis of molar heat capacities (Cp,m) of Pin and Ind, the thermodynamic functions of entropy, enthalpy, and Gibbs free energy at the temperature of 1 K interval for the two minerals were obtained for the first time.

A Kinetic Study of the Reaction between the 2-Ċ3H7 Radical and i-C4H8: Enthalpy of Formation of the (CH3)2CHCH2Ċ(CH3)2 Radical

2004 ◽  
Vol 218 (4) ◽  
pp. 469-478
Author(s):  
László Seres ◽  
Martin Dinse ◽  
Miklós Görgényi
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study ◽  
Enthalpy Of Formation ◽  
Rate Constant ◽  
Addition Reaction ◽  
Product Analysis ◽  
Temperature Range ◽  
Reversible Addition ◽  
First Time ◽  
The Enthalpy Of Formation

AbstractThe reversible addition reaction2-Ċ3H7 + i-C4H8 ⇔ (CH3)2CHCH2Ċ(CH3)2was studied in the temperature range 491–543K by product analysis in experiments in which 2-Ċ3H7 radicals were generated by the thermal decomposition of azoisopropane. The enthalpy of formation of the radical (CH3)2CHCH2Ċ(CH3)2 was determined, the value obtained being ΔfH° = -21.8 ± 5.2kJ mol-1. From this result, the following group value was deduced: ΔfH°[Ċ–(C)3] = 177.1kJ mol-1. From the latter, ΔfH°(t-Ċ4H9) = 51.6kJ mol-1 was estimated. The rate constant of self-combination of the radical (CH3)2CHCH2Ċ(CH3)2 was determined for the first time: log(k12/(dm3mol-1s-1)) = 7.3.

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 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

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