scholarly journals Calculation of partial molar volume changes at high pressures

1957 ◽  
Vol 10 (3) ◽  
pp. 359
Author(s):  
W Strauss
Keyword(s):  
Molar Volume ◽  
Partial Molar Volume ◽  
High Pressures ◽  
Volume Changes

High Pressure Carbon Behavior Induced from Carbide Hugoniots

1997 ◽  
Vol 499 ◽  
Author(s):  
T. Sekine ◽  
E. Takazawa ◽  
T. Kobayashi
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Molar Volume ◽  
Partial Molar Volume ◽  
High Pressures ◽  
Diamond Structure ◽  
Structural Variations ◽  
Diamond Phase ◽  
Type Carbide ◽  
Diamond Type

ABSTRACTInvestigations of Hugoniots the diamond-type carbides(various SiC) and NaCl-type carbides such as TiC give some insights into the high-pressure carbon behaviors. The experimental results of phase transitions of a-SiC and β-SiC, together with those of diamond-structure Si, imply that the candidate as post-diamond phase has sixfold coordination and that a possible transition pressure is about 1–2 TPa. The NaCl-type carbide Hugoniots indicate that sixfold coordinated C is very stable at high pressures. The partial molar volume of carbon in the NaCl-type carbides ranges between 1.4 to 2.6 cnvVg-atom C at 1 atm and reaches about 2.8 cm3/g-atom C at 100 GPa. Taking into account structural variations of the corresponding metals, the volume of the sixfold coordinated C is estimated to be 1.7 cm3/g-atom C, about half of that of diamond, and the post-diamond phase appears to be extremely hard.

scholarly journals A New Density Model of Quartz Solubility in H2O-CO2-NaCl Ternary Systems up to High Temperatures and High Pressures

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-23
Author(s):  
Weiping Deng ◽  
Qing Wei ◽  
Xuan Liu
Keyword(s):  
Experimental Data ◽  
Molar Volume ◽  
Partial Molar Volume ◽  
High Pressures ◽  
Pure Water ◽  
Molar Fraction ◽  
Density Model ◽  
Liquid Region ◽  
Lower Accuracy ◽  
Quartz Solubility

A novel density model for computing quartz solubility in H2O-CO2-NaCl hydrothermal fluids applicable to wide ranges of temperature and pressure is proposed. Based on the models of Akinfiev and Diamond (2009) and Wei et al. (2012), the effective partial molar volume of water ( V H 2 O ∗ ) is replaced by the partial molar volume of water ( V ¯ H 2 O ) by implementing an empirical correction, and water molar fraction ( x H 2 O ) is modified with water activity ( a H 2 O ), in addition to a series of changes to the model coefficient forms. The absolute values of averaged relative deviation of this model compared to the experimental data sets in pure water, H2O-CO2, and H2O-NaCl solutions are 5.74%, 6.69%, and 7.09%, respectively, which are better than existing models in the literature. The model can be reliably used for computing quartz solubilities in pure water from 0°C to 1000°C, from 0 bar to 20,000 bar, and in CO2- and/or NaCl-bearing solutions from 0°C to 1000°C, from 0 bar to 10,000 bar (with slightly lower accuracy at 5000-10,000 bar in H2O-NaCl systems) in the single liquid region. Moreover, the trends and overall ranges of this model may probably be more accurate in the H2O-CO2-NaCl fluid mixtures compared to the limited experimental data. In addition, a bisection algorithm for deriving the isopleths of quartz solubilities based on this new model is first proposed, and application perspectives are discussed for various geologic settings including subduction zone, lower crust-upper mantle, migmatite, pegmatite, porphyry, and orogenic deposits.

Sorption and partial molar volume of gases in polybutadiene

1989 ◽  
Vol 27 (11) ◽  
pp. 2243-2250 ◽  
Author(s):  
Yoshinori Kamiya ◽  
Yasutoshi Naito ◽  
Keishin Mizoguchi
Keyword(s):  
Molar Volume ◽  
Partial Molar Volume

Partial molar volume of water in phonolitic glasses and liquids

2001 ◽  
Vol 142 (2) ◽  
pp. 235-243 ◽  
Author(s):  
Ali M. Bouhifd ◽  
Alan Whittington ◽  
Pascal Richet
Keyword(s):  
Molar Volume ◽  
Partial Molar Volume
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