Free Energies and Entropies of Formation of KCl-KBr Solid Solutions at 25°1,2

1956 ◽  
Vol 78 (23) ◽  
pp. 5995-5998 ◽  
Author(s):  
W. H. McCoy ◽  
W. E. Wallace
Keyword(s):  
Solid Solutions ◽  
Free Energies

Some thermodynamic aspects of dissolution of solid solutions of hydroxylapatites of phosphorus and arsenic

1979 ◽  
Vol 57 (19) ◽  
pp. 2662-2664 ◽  
Author(s):  
T. S. B. Narasaraju ◽  
U. S. Rai
Keyword(s):  
Solid Solutions ◽  
Free Energies ◽  
Compositional Range ◽  
Calcium Phosphorus ◽  
Ph Range ◽  
Saturated Solutions

The solubility equilibria of synthetic samples of hydroxylapatite, its arsenic isomorph, and a series of their solid solutions, spread over the entire compositional range, were investigated at 37 °C in the pH range 5.0 to 7.6 in buffered systems through microanalytical determinations of calcium, phosphorus, and arsenic in their saturated solutions. From the ionic products of the samples so determined their stoichiometric dissolution was established and their free energies of solution evaluated.

An ideal solid solution model for calculating solubility of clay minerals

Clay Minerals ◽  
1981 ◽  
Vol 16 (4) ◽  
pp. 361-373 ◽  
Author(s):  
Y. Tardy ◽  
B. Fritz
Keyword(s):  
Solid Solution ◽  
Clay Minerals ◽  
Chemical Evolution ◽  
Solid Solutions ◽  
Natural Water ◽  
Free Energies ◽  
Natural Clay ◽  
Data Set ◽  
Solubility Products ◽  
End Members

AbstractA method for estimating Gibbs free energies and stabilities of clay minerals is proposed for use with computer programs aimed at calculating the chemical evolution of natural water-rock systems. This is based on (i) a model for ideal solid solutions of a large number of end-member compositions and (ii) a data set of estimated solubility products from 36 end-members. The application of the method to the production of experimental or natural clay stabilities is discussed.

Chemisorption of Moisture-Induced Hydrogen and the Embrittlement Effects in Transition Metal Aluminides

1994 ◽  
Vol 364 ◽  
Author(s):  
Jian-Sheng Wang
Keyword(s):  
Water Vapor ◽  
Transition Metal ◽  
Thermodynamic Properties ◽  
Solid Solutions ◽  
Free Energies ◽  
Thermodynamic Models ◽  
Metal Aluminides

AbstractBased on simple thermodynamic models free energies of chemisorption of water vapor in transition metal aluminides and enthalpies and entropies of formation of solid solutions of hydrogen in the aluminides are derived. Susceptibilities of the aluminides to moisture-induced embrittlement are evaluated with these thermodynamic properties and compared with the susceptibilities to hydrogen-induced embrittlement.

Excess free energies of mixing of Sr,Ba-bearing binary feldspar solid solutions (experimental data)

1995 ◽  
Vol 59 (394) ◽  
pp. 79-91 ◽  
Author(s):  
A. R. Kotelnikov ◽  
I. V. Chernysheva
Keyword(s):  
Solid Solutions ◽  
Phase State ◽  
Excess Energy ◽  
Free Energies ◽  
Chloride Solutions ◽  
Energy Of Mixing ◽  
Aqueous Chloride ◽  
The Stability ◽  
The Relationship ◽  
Excess Energy Of Mixing

AbstractThe distribution of potassium and strontium, potassium and barium between feldspars and aqueous chloride solutions was studied at 700°C, 2 kbar and 800°C, 2 kbar respectively. The distribution of Sr and Ba between coexisting feldspar and chloride solutions is not ideal; Sr and Ba are enriched in feldspar relative to solution. In order to estimate the phase state of the chloride solutions, special experiments were conducted using the synthetic fluid-inclusion method in the systems KCl-BaCl2-H2O and KCl-SrCl2-H2O at 700–800°C, 2 kbar. It was shown that (0.5M KCl+0.5M SrCl2) aqueous solution is homogeneous at 800°C, 2 kbar. The 0.25–0.5M SrCl2 solutions are homogeneous at 700°C 2, kbar. The (0.5M KCl+0.5M BaCl2) solution is homogeneous at 700°C, 2 kbar and heterogeneous at 800°C, 2 kbar. Margules parameters for describing the excess energy of mixing of the (K,Sr)- and (K,Ba)-feldspar solid solutions were calculated. The integrated values of excess energy of mixing () were estimated for the different binary feldspar solid solutions, and a correlation of with the crystallochemical parameter ρ = (RA-RB)/D(Me-O) was observed. Feldspar solid solutions can be subdivided into three groups based on the relationship between , p and the stability of the solid solution.

scholarly journals Thermodynamic Properties of Solid Solutions between Di-calcium Silicate and Tri-calcium Phosphate

2012 ◽  
Vol 31 (4-5) ◽  
pp. 421-430 ◽  
Author(s):  
M. Hasegawa ◽  
Y. Kashiwaya ◽  
M. Iwase
Keyword(s):  
Calcium Phosphate ◽  
Thermodynamic Properties ◽  
Phase Diagrams ◽  
Regular Solution ◽  
Solid Solutions ◽  
Phosphorus Removal ◽  
Calcium Silicate ◽  
Regular Solution Model ◽  
Free Energies ◽  
Hot Metal

AbstractFor a better understanding of phosphorus removal from hot metal, the Gibbs free energies of solid solutions between di-calcium silicate and tri-calcium phosphate were derived through applications of solutions models. The regular solution model with the parameters determined in this study gave the activities of the components thermodynamically consistent with the literature data and the phase diagrams.

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