By N. D. Chatterjee

Thermodynamic remedy of mineral equilibria, a subject matter critical to mineralogical thermodynamics, might be traced again to the tum of the century, whilst J. H. Van't Hoff and his affiliates pioneered in making use of thermodynamics to the mineral assemblages saw within the Stassfurt salt deposit. even though different well known researchers joined forces to boost the topic - H. E. Boeke even attempted to popularize it by way of giving an outline of the early advancements in his "Grundlagen der physikalisch-chemischen Petrographie", Berlin, 1915 - it remained, regularly, an esoteric topic for almost all of the modern geological group. obvious that approach, mineralogical thermodynamics got here of age over the last 4 a long time, and advanced very swiftly right into a mainstream self-discipline of geochemistry. It has contributed vastly to our figuring out of the part equilibria of mineral platforms, and has helped placed mineralogy and petrology on a company quantitative foundation. within the wake of those advancements, educational curricula now require the scholars of geology to take a path in easy thermodynamics, usually provided by way of the departments of chemistry. development on that origin, a supplementary path is usually provided to familiarize the scholars with diversified mineralogical functions of thermo­ dynamics. This e-book attracts from the author's adventure in giving any such direction, and has been adapted to cater to people who have had a prior publicity to the fundamental thoughts of chemical thermodynamics.

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4 Ideal, Excess, and Total Molar Properties The partial molar Gibbs energy of mixing of the component i in a nonideal solution, II. - """1 II~= RTlna·1 = RTlnX·1 +1 RTln'V· gm,l. 57a) may be split up into two parts. The first part id. 67) the superscript "ex" denoting an excess quantity. 72) Fig. 5 A schematic plot of G vs Xz of a solution at constant T o andP 22 Summary of Basic Thermodynamic Concepts: A Refresher In this expression, the sum of the first two terms, depicted by the dashed straight line in Fig.

59), also for a nonideal solution. From these considerations it is equally clear that an ideal solution is characterized by Yi=1 or RTlnYi=O across the entire range of Xi. By contrast, in nonideal solutions, Yi may be larger or smaller than 1, and is a function of Xi. The solution is said to exhibit a positive deviation from ideality if Yi> 1, while Yi<1 means a negative deviation. Regardless of whether a solution shows a positive or a negative deviation, it invariably approaches the limiting ideal behavior both as Xr-~ 1 andXi~O.

Although it reproduces the observed cop values faithfully, serious problems arise if such data need to be extrapolated beyond the experimental range of Co peT) measurements. 9) Depending upon the sign and magnitude of the coefficient "e" in Eq. 8), CO peT) might show a more or less pronounced maximum, or an inflection, beyond the T-range of experimental cop data, both of which run counter to the theory. In order to caution against such extrapolations, Robie et al. (1979) always specify the "range of validity" of their COp(T) functions.

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