Thermodynamic assessment of the MgO–Al2O3–SiO2 system

Thermodynamic properties of the phases in the MgO–Al2O3–SiO2 system were assessed, resulting in a set of self-consistent thermodynamic data. The two ternary compounds, cordierite and sapphirine, were optimized from subsolidus reactions. The liquid phase was described by the ionic two-sublattice model with a new species AlO2−1, yielding the formula (Al+3,Mg+2)P(AlO2−1,O−2,SiO4−4,SiO20)Q. Projection of the liquidus surface was calculated. Various isothermal and isoplethal sections were compared with the experimental data.

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Thermodynamic assessment of the Mg-Pb and Mg-Bi systems using substitutional solution and associate models for the liquid phase

Journal of Mining and Metallurgy Section B Metallurgy ◽

10.2298/jmmb130824017z ◽

2014 ◽

Vol 50 (2) ◽

pp. 115-126 ◽

Cited By ~ 7

Author(s):

F. Zhang ◽

Y. Tang ◽

B. Hu ◽

S. Liu ◽

Y. Du ◽

...

Keyword(s):

Experimental Data ◽

Liquid Phase ◽

Short Range ◽

Short Range Order ◽

Thermodynamic Assessment ◽

Calphad Approach ◽

Associate Model ◽

Substitutional Solution Model ◽

Self Consistent ◽

Equilibrium Data

By means of CALPHAD approach, thermodynamic assessments of the Mg-Pb and Mg-Bi systems were carried out based on the available experimental data including thermodynamic properties and phase equilibrium data. The liquid phase was described with both the substitutional solution model and the associate model, and two sets of self-consistent thermodynamic parameters for the Mg-Pb and Mg-Bi systems were obtained, respectively. It was found that the associate model can account for the experimental data more satisfactorily than the substitutional solution one, especially for the liquid phase with the short-range order behavior.

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Thermodynamic assessment of the Co-Mg binary system

Journal of Mining and Metallurgy Section B Metallurgy ◽

10.2298/jmmb210606051y ◽

2021 ◽

pp. 51-51

Author(s):

L.-F. Yang ◽

X-D Si ◽

H.-D. Zhang ◽

F.-G. Gao ◽

Y.-P. Zeng ◽

...

Keyword(s):

Experimental Data ◽

Phase Diagram ◽

Binary System ◽

Literature Review ◽

Thermodynamic Assessment ◽

Thermodynamic Description ◽

Thermodynamic Optimization ◽

Experimental Phase ◽

Experimental Phase Diagram ◽

Self Consistent

No thermodynamic description was performed for the Co-Mg binary system according to literature review. Consequently, this binary system has been investigated by means of CALPHAD (CALculation of PHAse Diagrams) approach in the present work. The experimental phase diagram and thermodynamic data available in the literature were critically assessed. Based on the reliable literature data, a new set of self-consistent thermodynamic parameters for the Co-Mg system is obtained. The calculated results agree well with the experimental data from the literature, indicating the reasonability of the present thermodynamic optimization.

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Glyptopetalum verticillatum (Celastraceae), a new species from Yunnan, China

Phytotaxa ◽

10.11646/phytotaxa.234.2.9 ◽

2015 ◽

Vol 234 (2) ◽

pp. 186

Author(s):

QUANRU LIU ◽

SHIYONG MENG ◽

DONGXIAN XU ◽

JINGLAN WANG ◽

SHAN WANG

Keyword(s):

Experimental Data ◽

New Species ◽

Molecular Data ◽

The Family ◽

Distinct Genus ◽

A New Species

The genus Glyptopetalum Thwaites (1856: 267) consists of approximately twenty species distributed in tropical and subtropical Asia (Liu & Funston 2008). It belongs to the family Celastraceae and is very close to the genus Euonymus Linnaeus (1753: 197). Hou (1962, 1963) provided the best overview of Glyptopetalum, describing plants of that genus as shrubs or small trees with 4-merous flowers, 4-locular ovaries, pendulous ovules, with one per locule, loculicidal capsules with persistent columella and branched raphes. In particular, he stressed that one ovule per cell, persistent columella and branched raphes are the most reliable characteristics for distinguishing Glyptopetalum from Euonymus. Simmons et al. (2012) consider both Glyptopetalum and Torralbasia as closely related to Euonymus based on their experimental data of two (of 20) species of Glyptopetalum. However, they recommend that Glyptopetalum continues to be recognized as distinct from Euonymus, based on the three reproductive differences noted by Hou (1963). Li et al. (2014) also support this view based on their molecular data. Consequently, we recommend that Glyptopetalum be recognized as a distinct genus in this paper.

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Thermodynamic modeling of the Fe−Zn system using exponential temperature dependence for the excess Gibbs energy

Journal of Mining and Metallurgy Section B Metallurgy ◽

10.2298/jmmb1101001t ◽

2011 ◽

Vol 47 (1) ◽

pp. 1-10 ◽

Cited By ~ 7

Author(s):

Y. Tang ◽

X. Yuan ◽

Y. Du ◽

W. Xiong

Keyword(s):

Experimental Data ◽

Liquid Phase ◽

Binary System ◽

Thermodynamic Properties ◽

Gibbs Energy ◽

Excess Gibbs Energy ◽

Miscibility Gap ◽

Exponential Equation ◽

Self Consistent ◽

Exponential Temperature Dependence

The Fe-Zn binary system was re?modeled using exponential equation Li=hi?exp(-T/?i) (i=0,1,2?) to describe the excess Gibbs energy of the solution phases and intermetallic compounds with large homogeneities. A self-consistent set of thermodynamic parameters is obtained and the calculated phase diagrams and thermodynamic properties using the exponential equation agree well with the experimental data. Compared with previous assessments using the linear equation to describe the interaction parameters, the artificial miscibility gap at high temperatures was removed. In addition, the calculated thermodynamic properties of the liquid phase were more reasonable than those resulting from all the previous calculations. The present calculations yield noticeable improvements to the previous calculations.

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A Thermodynamic Description of the Al-Ir System

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.2389 ◽

2007 ◽

Vol 539-543 ◽

pp. 2389-2394 ◽

Cited By ~ 5

Author(s):

Taichi Abe ◽

Machiko Ode ◽

Hideyuki Murakami ◽

Chang Seok Oh ◽

Cenk Kocer ◽

...

Keyword(s):

Experimental Data ◽

Binary System ◽

Thermodynamic Assessment ◽

Thermodynamic Description ◽

Calculated Data ◽

Intermetallic Phases ◽

Sublattice Model ◽

Calphad Technique ◽

Formation Enthalpies ◽

B2 Phase

The thermodynamic assessment of the Al-Ir binary system, one of the key sub-systems of the Ir-based alloys, was performed using the CALPHAD technique. The AlIr(B2) phase was described using the two sublattice model with the formula (Al,Ir)0.5(Ir,Va)0.5, while other intermetallic phases were treated as stoichiometric compounds. The calculated data of the phases in the Al-Ir system can be used to accurately reproduce experimental data, such as phase equilibria, invariant reactions, and formation enthalpies of the intermetallic phases.

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