A thermodynamic reassessment of the Al-As-Ga system

The Al-As-Ga system is one of the most important III-V mixed crystal systems because of its advantages as a heterostructure. There are more phase equilibria data available for this system over a wider range of temperatures and compositions, than for any other III-V ternary system. In this paper, the experimental phase diagram data of the Al-As-Ga ternary system have been assessed comprehensively and critically. Especially, the most recent experiments are considered. The interaction parameters of the liquid phase and the semiconductor compound are provided. With the assessed thermodynamic parameters, the pseudobinary AlAs-GaAs phase diagram, the Al-As-Ga ternary isothermal sections, and the solidus isoconcentration curves were calculated and compared with the related experimental data.     

A thermodynamic assessment of the Ga-In-P system

The experimental phase diagram data of the Ga-In-P ternary system have been critically assessed. The interaction parameters of the liquid phase and the semiconductor compound are provided. With the assessed thermodynamic parameters, the pseudobinary GaP-InP phase diagram and the Ga-In-P ternary isothermal sections were calculated and compared with the related experimental data.     

A thermodynamic assessment of the Ga-In-P system

The experimental phase diagram data of the Ga-In-P ternary system have been critically assessed. The interaction parameters of the liquid phase and the semiconductor compound are provided. With the assessed thermodynamic parameters, the pseudobinary GaP-InP phase diagram and the Ga-In-P ternary isothermal sections were calculated and compared with the related experimental data.     

A thermodynamic assessment of the In-As-Sb system

The experimental thermodynamic and phase diagram data of the In-As-Sb ternary system have been critically assessed. With the assessed thermodynamic parameters, the pseudobinary InAs-InSb phase diagram, the isothermal ternary sections and the thermodynamic properties are calculated and compared with the related experimental data.     

A thermodynamic assessment of the Ga-As-Sb system

The experimental phase diagram data of the Ga-As-Sb ternary system have been critically assessed. With the assessed thermodynamic parameters, the pseudobinary GaAs-GaSb phase diagram and the isothermal ternary sections were calculated and compared with the related experimental data.     

Assessment of phase diagram and thermodynamic properties of the Al-Ga-Sb system

The experimental thermodynamic and phase diagram data of the Al-Ga-Sb ternary system have been critically assessed. With the assessed thermodynamic parameters, the pseudobinary AlSbGaSb phase diagram, the isothermal ternary sections, and the thermodynamic properties were calculated and compared with the related experimental data.     

Critical evaluation and optimization of the thermodynamic properties and phase diagrams of the Al-Mg, Al-Sr, Mg-Sr, and Al-Mg-Sr Systems

All available thermodynamic and phase diagram data were critically assessed for all phases in the Al-Mg, Al-Sr, and Mg-Sr systems at 1 bar pressure from room temperature to above the liquidus temperatures. For these systems, all reliable data were simultaneously optimized to obtain a set of model equations for the Gibbs energy of the liquid alloy and all solid phases as functions of composition and temperature. The modified quasi-chemical model was used for the liquid. The Al-Mg-Sr ternary phase diagram was calculated from the optimized thermodynamic properties of the binary systems. Since no reliable ternary data were available, three assumptions were made: no ternary terms were added to the model parameters for the thermodynamic properties of the liquid, no ternary solid solutions are present in the system, and no ternary compound is present in the system. The calculated ternary phase diagram is thus a first approximation, which can be improved by the addition of new experimental data and can be used as a base for the calculation of phase diagrams of multicomponent systems.     

Mg-Zn-Si体系的相平衡计算及应用

利用Calphad方法重新评估了Mg-Si二元系的液相,并结合Mg-Zn和Zn-Si二元系热力学数据,外推得到Mg-Zn-Si三元系热力学参数;同时根据Mg2Si-MgZn2伪二元相图实验数据评估了Mg-Zn-Si系的液相三元相交互作用参数,计算相图与实验数据较一致。利用Scheil凝固模型模拟了Mg-2.33Zn-0.9Si(at%)合金的凝固过程,预测了镁合金在铸造冷却过程中的相演变信息,模拟计算结果与实验结果吻合较好     

Thermodynamic Assessments of Ternary Ga-As-P,Ga-P-Sb,In-As-P and In-P-Sb Systems

1 ＩｎｔｒｏｄｕｃｔｉｏｎＭｕｃｈａｔｔｅｎｔｉｏｎｈａｓｂｅｅｎｐａｉｄｔｏⅢ Ⅴｓｅｍｉｃｏｎｄｕｃｔｏｒｃｏｍｐｏｕｎｄｓｆｏｒｄｅｃａｄｅｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｉｍｐｏｒｔａｎｔａｐｐｌｉｃａｔｉｏｎｓｉｎｏｐｔｏｅｌｅｃｔｒｏｎｉｃａｎｄｈｉｇｈｓｐｅｅｄｅｌｅｃｔｒｏｎｉｃｄｅ ｖｉｃｅｓ .Ｔｈｅｍａｔｅｒｉａｌｓｏｒｄｅｖｉｃｅｓｃａｎｂｅｇｒｏｗｎｂｙｌｉｑｕｉｄｐｈａｓｅｅｐｉｔａｘｙ (ＬＰＥ ) ,ｃｈｅｍｉｃａｌｖａｐｏｒｄｅｐｏｓｉｔｉｏｎ(ＣＶＤ) ,ｍｏｌｅｃｕ ｌａｒ…     

A thermodynamic assessment of the Al-Cu-Mg ternary system

A thermodynamic assessment of the Al-Cu-Mg ternary system is presented. The Gibbs energies for the liquid and solid solution phases were modeled using the Redlich-Kister polynomial and the Wagner-Schottky model represented by the compound-energy formalism. The model parameters were obtained after fitting to previously critically assessed experimental phase diagram and thermodynamic data available in the literature. The thermodynamic functions and phase diagram calculated using the model parameters describe quite well the known experimental information. The complete set of Gibbs energies for all phases appearing in this system enables the calculation of thermodynamic values as a function of composition and temperature even for those ranges where no experimental information is available.     

Thermodynamic Assessments of Al-In-Sb and Al-In-As Systems

1 ＩｎｔｒｏｄｕｃｔｉｏｎⅢ Ⅴｓｅｍｉｃｏｎｄｕｃｔｏｒｍａｔｅｒｉａｌｓｏｒｄｅ ｖｉｃｅｓｃａｎｂｅｇｒｏｗｎｂｙｌｉｑｕｉｄｐｈａｓｅｅｐｉｔａｘｙ(ＬＰＥ) ,ｃｈｅｍｉｃａｌｖａｐｏｒｄｅｐｏｓｉｔ(ＣＶＤ ) ,ｍｏｌｅｃｕｌａｒｂｅａｍｅｐｉｔａｘｙ(ＭＢＥ)ａｎｄｓｏｏｎ .Ｒｅｌｉａｂｌｅｔｈｅｒｍｏｄｙｎａｍｉｃｄａｔａａｒｅｒｅｑｕｉｒｅｄｆｏｒｔｈｅｔｈｅｒｍｏｄｙｎａｍｉｃａｎａｌｙｓｅｓｏｆｔｈｅｓｅｐｒｏｃｅｓｓｅｓｔｏｏｂｔａｉｎａｏｐｔｉｍｕｍｄｅｓｉｇｎ[1 ].ＡＡｌ Ｇａ …     

Phase diagram of Fe-Cu-Si ternary system above 1523 K

Fe-Cu-Si ternary alloy phases are commonly formed during melting in a treatment process of domestic waste incineration that is currently being developed. The alloy phases appear in the incineration residue. Experiments were performed to observe phase equilibria in solid Fe+liquid, solid Si+liquid, the compound of FeSi liquid, and so forth, in the range 1523 to 1723 K. Then the phase diagram of Fe-Cu-Si ternary was thermodynamically assessed based on the present experimental results and literature data. It was found that this system has a wide liquid miscibility gap, and this two-liquid region is stable up to about 1900 K. The phase diagram of Fe-Cu-Si system assessed in the present work is much different from an earlier proposed diagram, but is very close to one recently evaluated. From the results obtained, the appropriate condition is discussed for the operation of the melting furnace for ash from municipal solid waste incinerators.     

Phase diagram of Fe-Cu-Si ternary system above 1523 K

Fe-Cu-Si ternary alloy phases are commonly formed during melting in a treatment process of domestic waste incineration that is currently being developed. The alloy phases appear in the incineration residue. Experiments were performed to observe phase equilibria in solid Fe+liquid, solid Si+liquid, the compound of FeSi liquid, and so forth, in the range 1523 to 1723 K. Then the phase diagram of Fe-Cu-Si ternary was thermodynamically assessed based on the present experimental results and literature data. It was found that this system has a wide liquid miscibility gap, and this two-liquid region is stable up to about 1900 K. The phase diagram of Fe-Cu-Si system assessed in the present work is much different from an earlier proposed diagram, but is very close to one recently evaluated. From the results obtained, the appropriate condition is discussed for the operation of the melting furnace for ash from municipal solid waste incinerators.     

Thermodynamic Modeling of the Ag-Au-Sb Ternary System

A thermodynamic assessment of the Ag-Au-Sb ternary system has been carried out using the CALPHAD method based on new thermodynamic and phase equilibria data that we have recently determined. The Ag-Sb binary system has also been reoptimized. The calculated phase diagram and thermodynamic properties of the ternary system Ag-Au-Sb show satisfactory general agreement with the experimental data. The liquidus projection and monovariant valleys of the ternary system are well reproduced by the optimized thermodynamic model parameters. Additional experiments to confirm the proposed reaction scheme, which involves two ternary transition peritectic reactions, are suggested.     

Thermodynamic optimization of the boron-cobalt-iron system

A thermodynamic optimization of the boron-cobalt-iron ternary system is performed based on thermodynamic models of the three constitutional binary systems and the experimental data on phase diagrams and thermodynamic properties of the ternary system. The liquid, fcc_A1, bcc_A2 and hcp_A3 solution phases are described by the substitutional solution model. The three intermediate line compounds, (Co,Fe)B, (Co,Fe)₂B and (Co,Fe)₃B, are described by the two sublattice model. A set of thermodynamic parameters are obtained. The calculated phase diagram and thermodynamic properties are in reasonable agreement with most of the experimental data.     

Experimental Investigation and Thermodynamic Calculation of Phase Equilibria in the Mg-Pb-Sn Ternary System

The phase equilibria of the Mg-Pb-Sn ternary system were investigated using a combined method of electron probe microanalyzer and x-ray diffraction. Three isothermal sections of the Mg-Pb-Sn ternary system at 200, 300 and 400 °C were experimentally established. The phase equilibria of Mg-Pb-Sn ternary system were thermodynamically assessed by using CALPHAD (Calculation of Phase Diagrams) method on the basis of the presently determined experimental data. A consistent set of thermodynamic parameters has been derived for describing the Gibbs free energies of each solution phase and intermetallic compound in the Mg-Pb-Sn ternary system. The calculated phase diagrams and thermodynamic properties in the Mg-Pb-Sn ternary system are in good agreement with experimental data.