scholarly journals Effect of alkaline earth metals on the heat capacity and change of thermodynamic function of AK1M2 alloy on the basis of specific aluminum

2020 ◽  
Vol 23 (3) ◽  
pp. 222-228
Author(s):  
I. N. Ganiev ◽  
S. E. Otajonov ◽  
M. Mahmudov ◽  
M. M. Mahmadizida ◽  
V. D. Abulkhaev
Keyword(s):  
Heat Capacity ◽  
Gibbs Energy ◽  
Temperature Dependence ◽  
Alkaline Earth ◽  
Reference Sample ◽  
Alkaline Earth Metals ◽  
Model Alloy ◽  
Cooling Mode ◽  
Cooling Rates ◽  
Enthalpy And Entropy

It is known that high purity aluminum with a minimum content of impurities is widely used in electronic technology for the manufacture of conductive paths in integrated circuits. Hence the development of new compositions of alloys based on such a metal is a very urgent task. One of the promising alloys based on such a metal is alloy AK1M2 (Al + 1 % Si + 2 % Cu). This alloy was accepted by us as a model alloy and subjected to modification by alkaline earth metals.Heat capacity is the most important characteristic of substances and by its variation with temperature one can determine the type of phase transformation, the Debye temperature, the energy of formation of vacancies, the coefficient of electronic heat capacity, and other properties. In the present work, the heat capacity of the AK1M2 alloy with alkaline earth metals was determined in the “cooling” mode from the known heat capacity of a reference sample from copper. For which, by processing the curves of the cooling rate of samples from the alloy AK1M2 with alkaline earth metals and the standard, polynomials were obtained which describe their cooling rates. Further, by experimentally found values of the cooling rates of the standard and samples from alloys, knowing their masses, the polynomials of the temperature dependence of the heat capacity of the alloys and the standard were established, which are described by a four-term equation. Using the integrals of the specific heat, the models of temperature dependence of the change in enthalpy, entropy and Gibbs energy were established.The dependences obtained show that with an increase in temperature, the heat capacity, enthalpy, and entropy of alloys increase, and the values of Gibbs energy decrease. At the same time, additives of alkaline earth metals do not significantly reduce the heat capacity, enthalpy and entropy of the original alloy AK1M2 and increase the value of Gibbs energy. During the transition from alloys with calcium with barium, the heat capacity of the alloys decreases, which correlates with the heat capacity of pure alkaline earth metals within the subgroup.

scholarly journals Temperature dependence of the heat capacity and change in the thermodynamic functions of strontium-alloyed AK1M2 alloy

2018 ◽  
Vol 4 (3) ◽  
pp. 119-124
Author(s):  
Izatullo N. Ganiev ◽  
Suhrob E. Otajonov ◽  
Nasim F. Ibrohimov ◽  
M. Mahmudov
Keyword(s):  
Heat Capacity ◽  
Gibbs Energy ◽  
Mathematical Models ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Thermodynamic Functions ◽  
Temperature Decrease ◽  
Cooling Mode ◽  
Enthalpy And Entropy ◽  
Aluminum Base

The temperature dependence of the specific heat capacity and change in the thermodynamic functions of strontium-alloyed ultrahigh-purity aluminum base AK1M2 alloy have been studied in “cooling” mode over the 298.15–900 K range. Mathematical models describing the evolution of these properties of the alloys in the abovementioned temperature range with change in alloying addition concentration have been obtained. The heat capacity, enthalpy and entropy of the alloys increase with temperature, decrease with an increase in the alloying addition concentration to 0.5 wt.% and grow with a further increase in the alloying addition concentration. The Gibbs energy of the alloys has an inverse dependence: it decreases with an increase in temperature and grows with an increase in the alloying addition concentration to 0.5 wt.%.

scholarly journals Temperature dependence of the specific heat and thermodynamic functions AК1М2 alloy, doped strontium

2019 ◽  
Vol 21 (1) ◽  
pp. 35-42 ◽  
Author(s):  
I. N. Ganiev ◽  
S. E. Otajonov ◽  
N. F. Ibrohimov ◽  
M. Mahmudov
Keyword(s):  
Heat Capacity ◽  
Gibbs Energy ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Specific Heat Capacity ◽  
Thermodynamic Functions ◽  
Inverse Relationship ◽  
Alloying Element ◽  
Enthalpy And Entropy ◽  
Increasing Temperature

In the heat «cooling» investigated the temperature dependence of the specific heat capacity and thermodynamic functions doped strontium alloy AK1М2 in the range 298,15—900 K. Mathematical models are obtained that describe the change in these properties of alloys in the temperature range 298.15—900 K, as well as on the concentration of the doping component. It was found that with increasing temperature, specific heat capacity, enthalpy and entropy alloys increase, and the concentration up to 0.5 wt.% of the alloying element decreases. Gibbs energy values have an inverse relationship, i.e., temperature — decreases the content of alloying component — is up to 0.5 wt.% growing.

scholarly journals Heat capacity and thermodynamic functions of aluminum conductive alloy E-AlMgSi (Aldrey) doped with gallium

2020 ◽  
Vol 22 (3) ◽  
pp. 219-227
Author(s):  
I. N. Ganiev ◽  
F. A. Aliev ◽  
H. O. Odinazoda ◽  
A. M. Safarov ◽  
J. H. Jayloev
Keyword(s):  
Heat Capacity ◽  
Aluminum Alloys ◽  
Gibbs Energy ◽  
Thermodynamic Functions ◽  
Cooling Mode ◽  
Initial Alloy ◽  
Production And Consumption ◽  
Electrical Industry ◽  
Scope Of Application ◽  
Enthalpy And Entropy

Aluminum — a metal whose scope of application is constantly expanding. At present, aluminum and its alloys in a number of areas successfully displace traditionally used metals and alloys. The widespread use of aluminum and its alloys is due to its properties, among which, first of all, low density, satisfactory corrosion resistance and electrical conductivity, ability to apply protective and decorative coatings should be mentioned. All this, combined with the large reserves of aluminum in the earth’s crust, makes the production and consumption of aluminum very promising. One of the promising areas for the use of aluminum is the electrical industry. Conductive aluminum alloys type E-AlMgSi (Aldrey) are representatives of this group of alloys.One of the promising areas for the use of aluminum is the electrical industry. Conducting aluminum alloys of the E-AlMgSi type (Aldrey) are representatives of this group of alloys. The paper presents the results of a study of the temperature dependence of heat capacity, heat transfer coefficient, and thermodynamic functions of an aluminum alloy E-AlMgSi (Aldrey) with gallium. Research conducted in the “cooling” mode. It is shown that the temperature capacity and thermodynamic functions of the E-AlMgSi alloy (Aldrey) with gallium increase, while the Gibbs energy decreases. Gallium additives up to 1 wt.% Reduce the heat capacity, enthalpy, and entropy of the initial alloy and increase the Gibbs energy.

scholarly journals PRASEODYMIUM IMPACT UPON TEMPERATURE DEPENDENCE OF SPECIFIC HEAT AND THERMODYNAMIC FUNCTION CHANGES OF ALUMINUM ALLOY AZh2.18

2019 ◽  
Vol 2019 (8) ◽  
pp. 56-63
Author(s):  
Неъмат Эсанов ◽  
Ne'mat Esanov ◽  
Изатулло Ганиев ◽  
Izatullo Ganiev ◽  
Абдувохид Хакимов ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Aluminum Alloy ◽  
Rare Earth ◽  
Gibbs Energy ◽  
Temperature Dependence ◽  
Modern Science ◽  
Chemical Properties ◽  
Earth Metal ◽  
Alloy Development ◽  
Enthalpy And Entropy

The last half century is characterized by great achievements in the field of aluminum alloy development. The development of new materials on aluminum basis with the purpose of operation reliability increase in different equipment, structures, mechanisms by means of the their formation selection substantiated scientifically requires the fulfillment of the investigation complex of physical-chemical properties and considered to be a significant problem of modern science. The application of alloys based on aluminum with the addition of iron and rare-earth metals as conducting materials in electronics for manufacturing motor car aircraft engines, wire, rods, tires and other products in electronic engineering is also known. In scientific literature there are no data on rare earth metal impact upon thermal-physical properties thermal-dynamic functions of aluminum alloys with iron. In this work in the mode of cooling there is investigated a temperature dependence of specific thermal capacity and changes of thermal-dynamic functions of the aluminum alloy AZh2.18 alloyed with praseodymium in the interval temperature 298.15-800 K. It is defined that with the temperature growth, heat capacity, enthalpy and entropy of alloys increases and the values of Gibbs energy decrease. It is shown that with the praseodymium concentration increase, heat capacity, enthalpy and entropy of alloys grow insufficiently, and Gibbs energy decreases.

On Temperature Dependence of Excess Gibbs Energy

1999 ◽  
Vol 64 (7) ◽  
pp. 1093-1099 ◽  
Author(s):  
Ivona Malijevská ◽  
Anatol Malijevský
Keyword(s):  
Heat Capacity ◽  
Gibbs Energy ◽  
Temperature Dependence ◽  
Excess Gibbs Energy ◽  
Excess Enthalpy ◽  
Excess Heat Capacity ◽  
Wilson Equation ◽  
Excess Heat ◽  
Energy Excess ◽  
Wilson And Nrtl Equations

Temperature dependence of GE is discussed for three widely used equations linear and nonlinear in parameters. It is shown that the Wilson equation predicts always positive excess heat capacity regardless of values of its parameters. Several temperature modifications of the Redlich-Kister, Wilson and NRTL equations are discussed with respect to the sign of the excess Gibbs energy, excess enthalpy and excess heat capacity.

Solubility of non-polar gases in cyclohexanone between 273.15 and 303.15 K at 101.32 kPa partial pressure of gas

1987 ◽  
Vol 65 (9) ◽  
pp. 2198-2202 ◽  
Author(s):  
María Asunción Gallardo ◽  
José María Melendo ◽  
José Santiago Urieta ◽  
Celso Gutierrez Losa
Keyword(s):  
Gibbs Energy ◽  
Partial Pressure ◽  
Temperature Dependence ◽  
Hard Sphere ◽  
Scaled Particle Theory ◽  
Sphere Diameter ◽  
Particle Theory ◽  
Enthalpy And Entropy

Solubility measurements of several non-polar gases (He, Ne, Ar, Kr, Xe, H2, D2, N2, O2, C2H4, C2H6, CF4, SF6, andCO2) in cyclohexanone at 273.15 to 303.15 K and a partial pressure of gas of 101.32 kPa, are reported. Gibbs energy, enthalpy, and entropy of solution at 298.15 K and 101.32 kPa partial pressure of gas were evaluated. Effective hard-sphere diameter temperature dependence has been studied and its effect on the calculated SPT (Scaled Particle Theory) solubilities, and enthalpies and entropies of solution was also examined.

scholarly journals Sequential anion-exchange separation of trace U, Th, Pb and lanthanides in environmental samples

2011 ◽  
Vol 1 (1) ◽  
pp. 209-212
Author(s):  
Y. Miyamoto ◽  
K. Yasuda ◽  
M. Magara ◽  
T. Kimura ◽  
S. Usuda
Keyword(s):  
Anion Exchange ◽  
Alkaline Earth ◽  
Reference Sample ◽  
Alkaline Earth Metals ◽  
Separation Technique ◽  
Anion Exchange Column ◽  
Elemental Concentrations ◽  
Icp Ms ◽  
Sequential Separation ◽  
Anion Exchange Separation

Abstract The sequential separation technique of U, Th, Pb, and the lanthanides with a single anion-exchange column was applied to analysis of the geochemical reference sample, JB-1. The separation technique was previously developed by the authors and reported. The sample was digested and dissolved in nitric acid. Five solutions of different volume containing 0.1–1 mg of the JB-1 were loaded on the separate columns, and the elements of interest in the solution were sequentially separated. The concentrations of the elements were measured with an ICP-MS. The elements were successfully separated and alkaline metals and alkaline earth metals were effectively eliminated from the elements. The elemental concentrations were concordant with the literature values within the deviation except for that of Th. The elemental concentrations were accurately determined in ≥500 μg of the JB-1 without subtraction of processing blanks.

Formation of hydrogen phosphites of alkaline earth metals

1980 ◽  
Vol 45 (8) ◽  
pp. 2283-2289 ◽  
Author(s):  
Ivan Lukeš ◽  
Miroslav Ebert
Keyword(s):  
Hydrogen Bond ◽  
Gibbs Energy ◽  
Alkaline Earth ◽  
Standard Gibbs Energy ◽  
Heterogeneous Systems ◽  
Alkaline Earth Metals

In this paper a study of heterogeneous systems MHPO3 -H3PO3 -H2O (M = Mg, Ca, Sr) at a temperature of 25°C using the Filippov's eutonic method has been described. Values of change in standard Gibbs energy for reactions of the studied systems have been found. Effect of the cation on hydrogen bond between the H2PO2-3 groups is discussed.

scholarly journals Effect of bismuth additions on the thermophysical and thermodynamical properties of E-AlMgSi (Aldrey) aluminum semiconductor alloy

2020 ◽  
Vol 6 (3) ◽  
pp. 107-112
Author(s):  
Izatullo N. Ganiev ◽  
Aslam P. Abulakov ◽  
Jamshed H. Jayloev ◽  
Umarali Sh. Yakubov ◽  
Amirsho G. Safarov ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Gibbs Energy ◽  
Thermodynamic Functions ◽  
Heat Conductivity ◽  
Economic Feasibility ◽  
Cooling Mode ◽  
Conductive Material ◽  
The Cost

The economic feasibility of using aluminum as a conductive material is explained by the favorable ratio of its cost to the cost of copper. In addition, one should take into account that the cost of aluminum has remained virtually unchanged for many years. When using conductive aluminum alloys for the manufacture of thin wire, winding wire, etc., certain difficulties may arise in connection with their insufficient strength and a small number of kinks before fracture. Aluminum alloys have been developed in recent years which even in a soft state have strength characteristics that allow them to be used as a conductive material. The electrochemical industry is one of the promising application fields of aluminum. E-AlMgSi (Aldrey) conductor aluminum alloys represent this group of alloys. This work presents data on the temperature dependence of heat capacity, heat conductivity and thermodynamic functions of the E-AlMgSi (Aldrey) aluminum alloy doped with bismuth. The studies have been carried out in "cooling" mode. It has been shown that the heat capacity and thermodynamic functions of the E-AlMgSi (Aldrey) aluminum alloy doped with bismuth increase with temperature and the Gibbs energy decreases. Bismuth additions of up to 1 wt.% reduce the heat capacity, heat conductivity, enthalpy and entropy of the initial alloy and increase the Gibbs energy.

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