Thermodynamic properties of illite, smectite and beidellite by calorimetric methods: Enthalpies of formation, heat capacities, entropies and Gibbs free energies of formation

2012 ◽  
Vol 89 ◽  
pp. 279-301 ◽  
Author(s):  
H. Gailhanou ◽  
P. Blanc ◽  
J. Rogez ◽  
G. Mikaelian ◽  
H. Kawaji ◽  
...  
Keyword(s):  
Thermodynamic Properties ◽  
Heat Capacities ◽  
Enthalpies Of Formation ◽  
Free Energies ◽  
Calorimetric Methods ◽  
Formation Heat

Calorimetric study of the digestion of gibbsite, Al(OH)3(cr), and thermodynamics of aqueous aluminate ion, Al(OH)4−(aq)

1991 ◽  
Vol 69 (11) ◽  
pp. 1685-1690 ◽  
Author(s):  
Qiyuan Chen ◽  
Yuming Xu ◽  
Loren G. Hepler
Keyword(s):  
Thermodynamic Properties ◽  
Aqueous Sodium Hydroxide ◽  
Sodium Aluminate ◽  
Heat Capacities ◽  
Enthalpies Of Formation ◽  
Calorimetric Study ◽  
Enthalpies Of Solution ◽  
Calorimetric Measurements ◽  
Wide Range ◽  
Standard Enthalpies Of Formation

We have made calorimetric measurements of the enthalpies of solution of gibbsite, Al(OH)3(cr), in aqueous sodium hydroxide solutions at five temperatures from 100 to 150 °C. Results of these measurements have been used to obtain the standard enthalpies of formation of Na+(aq) + Al(OH)4−(aq) at the experimental temperatures. These results have also led to values of ΔCp0 for the reaction represented concisely by Al(OH)3(cr) + OH−(aq) = Al(OH)4−(aq), from which we have obtained standard state partial molar heat capacities of Na+(aq) + Al(OH)4−(aq). Combination of our results with those from earlier investigations has permitted calculation of thermodynamic properties of Na+(aq) + Al(OH)4−(aq) over a wide range of temperature and thence some generalizations about the usefulness of various equations for representing or predicting these thermodynamic properties. Key words: gibbsite, enthalpy of solution; sodium aluminate (aqueous), thermodynamic properties; heat capacities, Na+(aq) + Al(OH)4−(aq).

Thermal Study of Groups II—IV Semiconductors. Lattice Heat Capacities and Free Energies of Formation. Heat Capacity of Mg2Si from 15°—300°K

1967 ◽  
Vol 47 (6) ◽  
pp. 2109-2115 ◽  
Author(s):  
B. C. Gerstein ◽  
F. J. Jelinek ◽  
M. Habenschuss ◽  
W. D. Shickell ◽  
J. R. Mullaly ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Heat Capacities ◽  
Thermal Study ◽  
Free Energies ◽  
Formation Heat ◽  
Lattice Heat

Thermodynamic properties of binary mixtures containing ketones. VIII. Heat capacities and volumes of some n-alkanone + n-alkane mixtures at 298.15 K

1984 ◽  
Vol 62 (5) ◽  
pp. 949-953 ◽  
Author(s):  
Jean-Pierre E. Grolier ◽  
George C. Benson
Keyword(s):  
Thermodynamic Properties ◽  
Composition Dependence ◽  
Constant Pressure ◽  
Excess Molar Volumes ◽  
Heat Capacities ◽  
Free Energies ◽  
Volumetric Heat Capacity ◽  
Text Data ◽  
Excess Molar Heat Capacities ◽  
Heat Capacity Measurements

Excess molar volumes, [Formula: see text], and excess molar heat capacities at constant pressure, [Formula: see text], have been obtained for some n-alkanone + n-alkane mixtures at 298.15 K from density and volumetric heat capacity measurements using liquid-flow techniques. The [Formula: see text] data are much more accurate than those estimated from the temperature dependence of other thermodynamic properties (excess free energies and/or excess enthalpies). The rather unusual composition dependence of the excess heat capacities — two minima, or W-shape curves — is most likely due to cooperative induced conformational molecular "arrangements" in these mixtures.

REACTION THERMODYNAMICS IN CHEMICAL VAPOR DEPOSITION OF BORON CARBIDES WITH BCl3–C3H6 (PROPENE)-H2 PRECURSORS

2008 ◽  
Vol 07 (06) ◽  
pp. 1269-1312 ◽  
Author(s):  
TAO WANG ◽  
KEHE SU ◽  
JUANLI DENG ◽  
YAN ZENG ◽  
QINGFENG ZENG ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Heat Capacities ◽  
Enthalpies Of Formation ◽  
Phase Reaction ◽  
Free Energies ◽  
Gaseous Species ◽  
Reaction Thermodynamics ◽  
Classical Thermodynamics

The gas phase reaction thermodynamics in the chemical vapor deposition (CVD) process of preparing boron carbides via the precursors of BCl 3– C 3 H 6(propene)– H 2 is investigated with a set of 325 gaseous species, in which the data for 135 species are evaluated in this work. The thermochemistry data are calculated with accurate model chemistry at G3(MP2) and G3//B3LYP levels. The concentration distribution of all of the 325 species is obtained with the principle of chemical equilibrium. The thermochemistry data include the heat capacities, entropies, enthalpies of formation, and Gibbs free energies of formation. The heat capacities and entropies at temperatures in 298.15–2000 K are evaluated with the standard statistical thermodynamics. The Gibbs free energies of formation in 298.15–2000 K are calculated with the classical thermodynamics based on the developed heat capacities and entropies. By including the crystal B 4 C , C (graphite), and B , the results for an example of the 3:1:2 precursors of BCl 3: C 3 H 6: H 2 show that the crystal B 4 C can be produced at temperatures higher than 700 K while the graphite has a higher molar value and can be produced at lower temperatures. It is also examined that the production of graphite can be controlled by changing the ratio of the injected reactants or pressure. It is interesting that BHCl 2, BCH 3 Cl 2, BH 2 Cl , and B 2 Cl 4 are found to be the most effective species in the CVD process, which is similar to those in the BCl 3– CH 4– H 2 system. The results predicted in this work are consistent with the experiments.

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