scholarly journals Hetero-Coordination in Liquid Pb-K Alloys

2015 ◽  
Vol 5 ◽  
pp. 87-90
Author(s):  
B. P. Singh ◽  
I. S. Jha ◽  
I. Koirala
Keyword(s):  
Enthalpy Of Mixing ◽  
Chemical Activity ◽  
Mixing Enthalpy ◽  
Interaction Energies ◽  
Molten State ◽  
Energy Of Mixing ◽  
Frame Work ◽  
Free Energy Of Mixing ◽  
Constituent Atom ◽  
Good Agreement

The observed asymmetry in properties of mixing of Pb-K alloys in the molten state is successfully explained on the basis of the quasi-lattice model. The thermodynamic functions such as free energy of mixing, enthalpy of mixing, entropy of mixing and chemical activity of the constituent atom of the alloys have been computed within the frame work of presented model. Most of the computed values are in good agreement with the experimental data. The pair-wise interaction energies between the species of the melt are found to depend considerably on temperature. Theoretical analysis suggests that hetero-coordination leading to the formation of complex Pb2K is likely to exist but is of weakly interacting in nature. The Himalayan Physics Vol. 5, No. 5, Nov. 2014 Page: 82-86

scholarly journals Theoretical Investigation of Energetic and its Effect on Cd-Hg Amalgam

2016 ◽  
Vol 3 (1) ◽  
pp. 60
Author(s):  
I. Koirala ◽  
B.P. Singh ◽  
I.S. Jha ◽  
A.K. Mallik
Keyword(s):  
Short Range ◽  
Chemical Activity ◽  
Heat Of Mixing ◽  
Interaction Energies ◽  
Long Wavelength ◽  
Energy Of Mixing ◽  
Frame Work ◽  
Free Energy Of Mixing ◽  
Constituent Atom ◽  
Good Agreement

<p>The observed anomaly in properties of mixing of Cd-Hg alloys in the molten state is successfully explained on the basis of the quasi-lattice model. The thermodynamic functions such as free energy of mixing, heat of mixing, entropy of mixing and chemical activity of the constituent atom of the alloys and microscopic functions like concentration-concentration fluctuation in long wavelength limit and Warren-Cowley short range order parameter of the alloys have been computed within the frame work of presented model. Most of the computed values are in good agreement with the experimental data. The pair-wise interaction energies between the species of the melt are found to depend considerably on temperature. Theoretical analysis suggests that hetero-coordination leading to the formation of complex Cd<sub>2</sub>Hg is likely to exist but is of weakly interacting in nature.</p><p>Journal of Nepal Physical Society Vol.3(1) 2015: 60-66</p>

scholarly journals Thermodynamic and structural properties of Mg-Tl liquid alloy

BIBECHANA ◽  
2012 ◽  
Vol 8 ◽  
pp. 81-89 ◽  
Author(s):  
BP Singh ◽  
D Adhikari ◽  
IS Jha ◽  
BC Kumar ◽  
SK Chaudhary ◽  
...  
Keyword(s):  
Short Range ◽  
Enthalpy Of Mixing ◽  
Mixing Enthalpy ◽  
Mixing Properties ◽  
Long Wavelength ◽  
Energy Of Mixing ◽  
Chemical Complex ◽  
Free Energy Of Mixing ◽  
Associated Solution Model ◽  
Associated Solution

The concentration dependent asymmetry in mixing properties of Mg-Tl liquid alloys at 923 K has been investigated on the basis of regular associated solution model. The concentration of ApB type complex in a regular associated solution of Mg and Tl have been determined. We have then used the concentration of complex to calculate the free energy of mixing, enthalpy of mixing, entropy of mixing, activity, concentration fluctuations in long wavelength limit SCC(0) and the Warren Cowley short-range parameter 1 α .The analysis suggests that heterocoordination leading to the formation of chemical complex Mg2Tl is likely to exist in the melt. The analysis reveals that there is a tendency of unlike atom pairing (Mg-Tl) in Mg-Tl alloy whole range of concentration.Keywords: Mg-Tl alloy; microscopic structure; pairwise interaction energy; chemical short range orderDOI: http://dx.doi.org/10.3126/bibechana.v8i0.5692BIBECHANA 8 (2012) 81-89

scholarly journals Energy Disorder in Liquid Fe-Si Alloy

2011 ◽  
Vol 1 ◽  
pp. 37-40
Author(s):  
D. Adhikari ◽  
I. S. Jha ◽  
B. P. Singh
Keyword(s):  
Pairwise Interaction ◽  
Heat Of Mixing ◽  
Interaction Energies ◽  
Molten State ◽  
Energy Disorder ◽  
Energy Of Mixing ◽  
Free Energy Of Mixing ◽  
Alloy Clusters ◽  
Associated Solution Model ◽  
Associated Solution

The observed asymmetry in the properties of mixing of Fe-Si alloy in molten state is successfully explained on the basis of regular associated solution model. We have determined the free energy of mixing, heat of mixing and entropy of mixing of Fe-Si alloys in molten state at 1873 K. The analysis suggests that heterocoordination leading to the formation of complex Fe 2Si is likely to exist in the liquid and is of a strongly interacting nature. The theoretical analysis reveals that the pairwise interaction energies between the species depend considerably on temperature.Keywords: Liquid alloy; Clusters; Thermodynamic propertiesThe Himalayan Physics Vol.1, No.1, May, 2010Page: 37-40Uploaded Date: 28 July, 2011

scholarly journals Theoretical assessment on hetero-coordination of Alloys Silver-Antimony at Molten State

2020 ◽  
pp. 68-73
Author(s):  
Narayan Panthi ◽  
Indra Bahadur Bhandari ◽  
Ishwar Koirala
Keyword(s):  
Reasonable Agreement ◽  
Chemical Activity ◽  
Heat Of Mixing ◽  
Thermodynamic Quantities ◽  
Molten State ◽  
Energy Of Mixing ◽  
Interchange Energy ◽  
Free Energy Of Mixing ◽  
Experimental Values ◽  
Theoretical Assessment

The thermodynamic and structural properties of binary alloy Ag- Sb at temperature 1250K have been reported theoretically using quasi lattice model. The interchange energy has been considered a function of a temperature and thus various thermodynamic quantities are calculated at elevated temperature. The theoretical values of free energy of mixing, heat of mixing, entropy of mixing and chemical activity are reasonable agreement with experimental values in all concentrations of antimony from 0.1 to 0.9. The theoretical analysis tells that the alloy shows both ordering nature in Ag rich end and segregating nature in Sb rich end .The study reveals that the properties of alloy are asymmetric around equi-atomic composition. The Ag_3 Sn complexes are most likely to exist in the liquid state and are moderately interacting.

scholarly journals Effect of temperature on mixing behavior and stability of liquid Al-Fe alloys

2021 ◽  
Vol 2070 (1) ◽  
pp. 012025
Author(s):  
I B Bhandari ◽  
N Panthi ◽  
S Gaire ◽  
Ishwar Koirala
Keyword(s):  
Free Energy ◽  
Surface Composition ◽  
Dynamic Properties ◽  
Enthalpy Of Mixing ◽  
Effect Of Temperature ◽  
Mixing Enthalpy ◽  
Energy Parameters ◽  
Energy Of Mixing ◽  
Free Energy Of Mixing ◽  
Experimental Values

Abstract A theoretical model based on the assumption of compound formation in binary liquid alloy has been used to investigate the thermodynamic properties (free energy of mixing, enthalpy of mixing and entropy of mixing), microscopic properties (concentration fluctuation in long wavelength limit and chemical short range order parameter), surface properties (surface tension and surface composition) and dynamic properties ( viscosity and diffusion coefficient). All the properties of Al2Fe binary melt have been measured using the same energy parameters configured for experimental values of free energy of mixing. The energy parameters are detected as independent of concentration, but depend on temperature. The findings are well consistent with the experimental standards.

scholarly journals STUDY OF SEGREGATING NATURE IN LIQUID Al-Ga ALLOYS

2015 ◽  
Vol 12 (12) ◽  
pp. 14-20 ◽  
Author(s):  
I Koirala ◽  
B P Singh ◽  
I S Jha
Keyword(s):  
Surface Properties ◽  
Surface Segregation ◽  
Input Parameter ◽  
Enthalpy Of Mixing ◽  
Mixing Enthalpy ◽  
Temperature Dependent ◽  
Long Wavelength ◽  
Structural Functions ◽  
Energy Of Mixing ◽  
Free Energy Of Mixing

We report energetic of mixing behavior of liquid Al-Ga alloys, using simple statistical theory through concentration dependence thermodynamic, structural, transport and surface properties at 1023K. The concentration dependent thermodynamic functions (free energy of mixing, enthalpy of mixing, entropy of mixing and activity coefficient of the component), structural functions (concentration fluctuation in the long wavelength limit and chemical short range order parameter), transport properties (diffusivity and viscosity) and surface properties (surface segregation and surface tension) have got special attention to show a tendency of homo-coordination of atom in the mixture. The theoretical analysis reveals that input parameter, order energy is temperature dependent and Al-Ga alloys is of weakly interacting system.Scientific World, Vol. 12, No. 12, September 2014, page 14-20    

scholarly journals Thermodynamic properties of liquid InNa alloys

BIBECHANA ◽  
2012 ◽  
Vol 9 ◽  
pp. 165-174
Author(s):  
AK Mishra ◽  
M Milanarun
Keyword(s):  
Thermodynamic Properties ◽  
Theoretical Study ◽  
Stoichiometric Composition ◽  
Enthalpy Of Mixing ◽  
Mixing Enthalpy ◽  
Size Difference ◽  
Formation Model ◽  
Energy Of Mixing ◽  
Asymmetric Behaviour ◽  
Free Energy Of Mixing

Concept of complex formation model has been applied to account for the thermodynamic properties of liquid InNa alloy. The theoretical study reveals that the intermetallic compound In3Na2 exists at stoichiometric composition. Our expressions reproduce successfully the asymmetric behaviour of free energy of mixing, enthalpy of mixing, s-type entropy of mixing, CSRO and phase separation in liquid In- Na alloy. It is found that Na atoms segregate on the surface. The study reveals that various factors such as size difference and electronegative factor are not sufficient to account for the asymmetry in the system. The low value of order energy suggests that In-Na is a weak interacting system DOI: http://dx.doi.org/10.3126/bibechana.v9i0.7192 BIBECHANA 9 (2013) 165-174

scholarly journals Viscosity of liquid Na-K alloy

BIBECHANA ◽  
2014 ◽  
Vol 12 ◽  
pp. 135-144 ◽  
Author(s):  
R. P. Koirala ◽  
B. P. Singh ◽  
I. S. Jha ◽  
D. Adhikari
Keyword(s):  
Experimental Data ◽  
Atmospheric Pressure ◽  
Composition Dependence ◽  
Dynamic Behaviour ◽  
Enthalpy Of Mixing ◽  
Mixing Properties ◽  
Energy Of Mixing ◽  
Using Data ◽  
Free Energy Of Mixing ◽  
Theoretical Assessment

The present work reports a theoretical assessment of the composition dependence of mixing properties of liquid Na-K alloy at 384K at fixed pressure, most likely, at the atmospheric pressure. In this work we have estimated the interaction energy in the alloy at the mentioned temperature on the basis of quasi-chemical approximation for regular alloy and employed it to work out basic thermodynamic properties of mixing such as free energy of mixing, entropy of mixing and enthalpy of mixing as function of composition of the alloy. To understand the dynamic behaviour in the liquid Na-K alloy, we have carried out theoretical investigation of viscosity under consideration of Moelwyn-Hughes equation by using data for enthalpy of mixing obtained from quasi-chemical approximation. Due to scanty of experimental data on viscosity of Na-K alloy at 384K, we have performed computation of viscosity also from Kaptay equation for comparison. The calculations have shown that there is a good match between theoretically computed thermodynamic functions and the available corresponding experimental data. The sets of viscosity values obtained against composition from the two equations show deviations from the ideality and themselves are reasonably comparable to each other.DOI: http://dx.doi.org/10.3126/bibechana.v12i0.11797BIBECHANA 12 (2015) 128-137

scholarly journals A Theoretical study of thermodynamic properties of Cd-Bi liquid alloy

BIBECHANA ◽  
1970 ◽  
Vol 8 ◽  
pp. 90-95
Author(s):  
D Adhikari
Keyword(s):  
Free Energy ◽  
Thermodynamic Properties ◽  
Liquid Alloy ◽  
Theoretical Study ◽  
Energy Parameter ◽  
Heat Of Mixing ◽  
Liquid Alloys ◽  
Energy Of Mixing ◽  
Free Energy Of Mixing ◽  
Good Agreement

Flory’s model has been used for the study of thermodynamic properties of Cd-Bi liquid alloys. Free energy of mixing, heat of mixing, entropy of mixing and activity of Cd have been determined. All of these computed quantities have been found to be in a good agreement with observed values.Keywords: Flory’s model; thermodynamic properties; Cd-Bi liquid alloy; weakly interacting system; interaction energy parameter  DOI: http://dx.doi.org/10.3126/bibechana.v8i0.5693  BIBECHANA 8 (2012) 90-95

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