Thermodynamic Data on Oxides and Silicates
An Assessed Data Set Based on Thermochemistry and High Pressure Phase Equilibrium
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Dr. Surendra K. Saxena
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Book
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Chapter
Assessment of Solid Solution Parameters for Some Silicates
Various solid solution models were discussed by Fei et al. (1986). There are two different groups of solution models. The first group of models has their origin in the Flory-Huggins model (Flory, 1953), in whi...
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Chapter
Introduction: Thermodynamic Data Systematics
There are different sources of data available for establishing an internally consistent data set: calorimetric measurements, phase equilibrium data, measured thermophysical properties of a phase, and heat capa...
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Techniques for Data Assessment
Various techniques are adopted in the systematization, depending upon the complexity of a problem, to construct the internally consistent data base. The phases considered in this study can be classified into f...
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Assessment of Data on Some Oxides and Silicates: Calorimetry and High-Pressure Phase Equilibrium Experiments
The high pressure phase equilibrium calculations require a special consideration of both the P-V-T properties of the solids and fluids and the high-temperature extrapolation of the heat capacity data. The appropr...
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Thermodynamic Relations
The change in Gibbs free energy (ΔG) as a function of temperature (T) and pressure (P) can be obtained from the relations:
2.1 $$ {\left... -
Chapter
Assessment of Data on Some Oxides and Silicates: Calorimetry and Low-Pressure Phase Equilibrium Experiments
Recently, through experimental study, much data have accumulated on the stability of oxides and silicates. In this chapter, an internally consistent thermodynamic data base on some oxides and silicates is pres...
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Book
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Chapter
Order-Disorder in Silicates
Long range order-disorder phenomena in silicates differ from those in alloys in several important respects. First, as opposed to alloys, silicates contain structural sites with definite polyhedral geometries a...
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Chapter
Feldspar Crystalline Solution
Although important information on crystal structure and experimental phase relationship has been accumulating for decades, it is only recently that attempts have been made to use such information in understand...
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Chapter
Introduction and Acknowledgements
This monograph is written for advanced students and research workers in the fields of mineralogy, petrology and physical geochemistry. It introduces the reader to the popular solution theories and the special ...
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Thermodynamic Models for Crystalline Solutions
Composition of coexisting minerals occurring in rocks or in experiments are the main source of data to be used in obtaining the information on the thermodynamic behaviour of silicate crystalline solutions. It ...
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Composition of Coexisting Phases
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Measurement of Component Activities by Analysis of Two-Phase Data
An experimental measurement of activities of components in a crystalline solution, particularly the silicates, is beset with difficulties and the measured values are subject to large errors. Therefore, obtaini...
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Chapter
Pyroxene Crystalline Solution
Orthopyroxene is one of the few important rock-forming minerals that can be considered as quasi-binary without significant loss of accuracy. Usually more than 95% of the mineral is a crystalline solution of th...
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Olivine Crystalline Solution
Olivines (Fe, Mg, Ca)2Si2O4 are important constituents of many igneous and metamorphic rocks. The thermodynamic properties of olivines have been studied recently by several workers (Kitayama and Katsura, 1968; Na...
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Crystalline Solutions and Geothermometry
The concept of metamorphic facies evolved through the attempts of the petrologists to distinguish the mineral assemblages formed at different P and T in the field. In several cases, the physical and chemical cond...
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Thermodynamic Relations in Crystalline Solutions
Thermodynamic relations between the concentration of a component in a solution and its chemical potential and other thermodynamic functions of mixing are presented here. The details of the simplifying assumpti...
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Thermodynamic Stability of a Solution
For binary or multi-component crystalline solutions, the stability is determined by the diffusion processes. Above a certain temperature two end member crystals may form a complete crystalline solution series....
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Measurement of Component Activity Using Composition of Coexisting Minerals
Experimental data on the distribution of a component between two coexisting crystalline solutions at a fixed P and T for systems such as olivine and pyroxene have been collected by Nafziger and Muan (1967), Larim...
