scholarly journals Calculation of activities in Ga-Cd and Cu-Pb binary systems

2002 ◽  
Vol 38 (3-4) ◽  
pp. 273-284 ◽  
Author(s):  
Dragan Manasijevic ◽  
Dragana Zivkovic ◽  
Zivan Zivkovic
Keyword(s):  
Melting Point ◽  
Phase Diagrams ◽  
Binary Systems ◽  
Composition Range ◽  
Entire Composition Range ◽  
Melting Point Depression ◽  
Calculation Methods ◽  
Duhem Equation ◽  
Coexisting Phases ◽  
Mutual Comparison

Calculations of activities in Ga-Cd and Cu-Pb binary systems were done based on their known phase diagrams, using different calculation methods. First, activities of cadmium at 700 K and copper at 1263 K in Ca - Cd and Cu - Pb systems, respectively, were calculated by melting point depression method and Zhang-Chou method for binary systems with phase diagrams involving two liquid or solid coexisting phases. In order to obtain activity values in the entire composition range, these methods were applied in the definite parts of composition range in both investigating systems. The same procedure was done, using modified Rao- Belton method by Chou, who used Richardson assumption. Activities of the second component in both investigating systems were calculated by use of Gibbs-Duhem equation. All calculated results were compared with literature data and mutual comparison between applied methods was done.

scholarly journals Calculation of activities in some gallium-based systems with a miscibility gap

2003 ◽  
Vol 68 (8-9) ◽  
pp. 665-675 ◽  
Author(s):  
Dragan Manasijevic ◽  
Dragana Zivkovic ◽  
Iwao Katayama ◽  
Zivan Zivkovic
Keyword(s):  
Thermodynamic Properties ◽  
Phase Diagrams ◽  
The Other ◽  
Miscibility Gap ◽  
Liquid Alloys ◽  
Duhem Equation ◽  
Coexisting Phases ◽  
Temperature Ranges

The calculations of thermodynamic properties in some gallium-based systems with a miscibility gap ? Ga?Tl, Ga?Hg and Ga?Pb are presented in this paper. The determination of the gallium activities in the mentioned liquid alloys was based on their known phase diagrams using the Zhang-Chou method for calculating activities from phase diagrams involving two liquid or solid coexisting phases. The activities of gallium in Ga?Tl, Ga?Hg and Ga?Pb system were calculated in the 973?1273 K, 573?873 K and 1000?1100 K temperature ranges, respectively. The activities of the other component in all the investigated systems were obtained by the Gibbs-Duhem equation. The results of the calculations are compared with literature data.

scholarly journals Activity measurement of Ga in liquid Ga-Pb alloys by EMF method with zirconia solid electrolyte

2002 ◽  
Vol 38 (3-4) ◽  
pp. 229-236 ◽  
Author(s):  
I. Katayama ◽  
Dragana Zivkovic ◽  
Dragan Manasijevic ◽  
T. Oishi ◽  
Zivan Zivkovic ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Composition Range ◽  
Electrochemical Cell ◽  
Experimental Methods ◽  
Entire Composition Range ◽  
Activity Measurement ◽  
Published Data ◽  
Emf Method ◽  
Positive Deviation ◽  
Duhem Equation

EMF measurement of the electrochemical cell with zirconia as solid electrolyte was performed to determine the gallium activity from 950 to 1150K in the entire composition range of liquid Ga-Pb alloys. In the whole concentration range, activity of Ga shows moderately positive deviations from ideality, and activity of Pb which is derived by Gibbs- Duhem equation shows also positive deviation from ideality. These are compared with published data obtained by different experimental methods.

Activity Measurement of Liquid Sn-Ag-Bi Alloys by Fused Salt EMF Method

2005 ◽  
Vol 502 ◽  
pp. 129-138 ◽  
Author(s):  
Iwao Katayama ◽  
Toshihiro Tanaka ◽  
Shin-ichi Akai ◽  
Kisao Yamazaki ◽  
Takamichi Iida
Keyword(s):  
Binary Systems ◽  
Composition Range ◽  
Excess Free Energy ◽  
Ternary Alloys ◽  
Activity Measurement ◽  
Duhem Equation ◽  
Fused Salts ◽  
Energy Of Mixing ◽  
Free Energy Of Mixing ◽  
Small Positive Deviation

Activity of tin in liquid Sn-Ag-Bi alloys was derived by EMF measurement of galvanic cell with fused salts electrolyte in the temperature range of 700 to 900K in the whole composition range. Activity of tin at 900K shows very small positive deviation from Raoult’s low for Sn-Bi alloys. Activity of ternary alloys was measured along three pseudo binary systems of Sn-(Ag,Bi) (where xAg/xBi =1/3,1/1 and 3/1). Its concentration dependence is very complex. From the iso-activity curves in the ternary system excess free energy of mixing is derived using Darken’s method for Gibbs-Duhem equation

Thermodynamic assessment of the Sb–S and In–S binary systems

2021 ◽  
Vol 112 (5) ◽  
pp. 373-383
Author(s):  
Chuang Shi ◽  
Na Li ◽  
Weibin Zhang
Keyword(s):  
Phase Diagrams ◽  
Binary Systems ◽  
Thermodynamic Assessment ◽  
Composition Range ◽  
Liquid Immiscibility ◽  
Experiment Data ◽  
Wide Composition Range ◽  
Melting Compound ◽  
Self Consistent ◽  
Associate Species

Abstract The Sb–S and In–S binary systems were assessed thermodynamically using the CALculation of PHase Diagrams (CAL-PHAD) approach based on the experiment data in the literature. Both phase diagrams revealed a congruent melting compound and liquid immiscibility. Therefore, associate species, Sb2S3 and In2S3, were introduced into the associate model to describe the liquid phase during optimization. The binary intermediate compounds, Sb2S3, InS(α, β), and In6S7, were treated as stoichiometric phases. Considering the wide composition range, In2S3(α, β, γ), were modeled using the sublattice model. A set of self-consistent thermodynamic parameters representing most of the reliable thermodynamic properties and phase diagram information were derived.

Calculation of phase diagrams and thermodynamic properties of 14 additive and reciprocal ternary systems containing Li2CO3, Na2CO3, K2CO3, Li2SO4, Na2SO4, K2SO4, LiOH, NaOH, and KOH

1984 ◽  
Vol 62 (3) ◽  
pp. 457-474 ◽  
Author(s):  
A. D. Pelton ◽  
C. W. Bale ◽  
P. L. Lin
Keyword(s):  
Phase Diagram ◽  
Thermodynamic Properties ◽  
Molten Salt ◽  
Phase Diagrams ◽  
Binary Systems ◽  
Ternary Phase ◽  
Ternary Phase Diagram ◽  
Ternary Systems ◽  
Maximum Error ◽  
Critical Assessment

Phase diagrams and thermodynamic properties of five additive molten salt ternary systems and nine reciprocal molten salt ternary systems containing the ions Li+, Na+, [Formula: see text], OH− are calculated from the thermodynamic properties of their binary subsystems which were obtained previously by a critical assessment of the thermodynamic data and the phase diagrams in these binary systems. Thermodynamic properties of ternary liquid phases are estimated from the binary properties by means of the Conformal Ionic Solution Theory. The ternary phase diagrams are then calculated from these thermodynamic properties by means of computer programs designed for the purpose. It is found that a ternary phase diagram can generally be calculated in this way with a maximum error about twice that of the maximum error in the binary phase diagrams upon which the calculations are based. If, in addition, some reliable ternary phase diagram measurements are available, these can be used to obtain small ternary correction terms. In this way, ternary phase diagram measurements can be smoothed and the isotherms drawn in a thermodynamically correct way. The thermodynamic approach permits experimental data to be critically assessed in the light of thermodynamic principles and accepted solution models. A critical assessment of error limits on all the calculated ternary diagrams is made, and suggestions as to which composition regions merit further experimental study are given.

Melting point depression in poly(butylene terephthalate)/polyarylate blends

1993 ◽  
Vol 26 (12) ◽  
pp. 3127-3130 ◽  
Author(s):  
Peter P. Huo ◽  
Peggy Cebe
Keyword(s):  
Melting Point ◽  
Melting Point Depression ◽  
Butylene Terephthalate

The Si–Sr and Si–Ba phase diagrams over the Si-rich composition range

Calphad ◽  
2010 ◽  
Vol 34 (2) ◽  
pp. 196-199 ◽  
Author(s):  
B. Rygalin ◽  
V. Prokofieva ◽  
L. Pavlova ◽  
Y.E. Sokolov
Keyword(s):  
Phase Diagrams ◽  
Composition Range
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