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Thursday, July 16, 2020 | History

2 edition of Thermodynamic aspects of some silicate melts found in the catalog.

Thermodynamic aspects of some silicate melts

K. P. Abraham

Thermodynamic aspects of some silicate melts

by K. P. Abraham

  • 112 Want to read
  • 25 Currently reading

Published by s.n.] in [s.l .
Written in English

    Subjects:
  • Silicates,
  • Silicate minerals,
  • Slag -- Thermodynamics,
  • Slag,
  • Metallurgy

  • Edition Notes

    Statementby K.P. Abraham.
    Classifications
    LC ClassificationsQE"389.62"A37
    The Physical Object
    Pagination145 p.
    Number of Pages145
    ID Numbers
    Open LibraryOL21659212M

    Thermodynamic equilibrium is an axiomatic concept of is an internal state of a single thermodynamic system, or a relation between several thermodynamic systems connected by more or less permeable or impermeable thermodynamic equilibrium there are no net macroscopic flows of matter or of energy, either within a system or between systems. silicate glasses and melts. X-ray and neutron scattering, spectroscopy, andtheoretical calculations now provide a reasonably clear picture of many aspects of the short-range structure of glasses (which approximates the melt structure at the glass transition temperature). Critical effects of redox conditions and volatiles on structure have been.

    In this work, we explore the thermodynamic evolution in a melt-quenched metal–organic framework glass, formed from ZIF upon heating to the melting point (T m), and subsequent enthalpy temperature dependence of the difference in Gibbs free energy between the liquid and crystal states of ZIF in the temperature range from the glass transition temperature (T g) to T m is. @article{osti_, title = {Phase equilibria and higher order critical points in silicate melt solutions}, author = {Corrales, L R and Keefer, K}, abstractNote = {A detailed understanding of the relationship between the underlying molecular structure, the thermodynamics of silicate melts and their phase solubilities is essential in predicting chemical durability and physical properties of.

    This book summarizes the experimental evidence and modern classical and theoretical approaches in understanding the vitreous state, from structural problems, over equilibrium and non-equilibrium thermodynamics, to statistical physics. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.


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Thermodynamic aspects of some silicate melts by K. P. Abraham Download PDF EPUB FB2

The density of a silicate melt may be determined by evaluating the quotient () ρ = Σ X i M i / Σ X i V i where X i is the mole fraction, M i is the molar mass, and V i is the partial molar volume of the ith oxide component in the melt. Although V i depends weakly on composition, to a good approximation, it may be taken independent of composition and as a function of temperature and Cited by: Despite the paucity of direct density measurements of H 2 O- and CO 2-bearing silicate liquids, thermodynamic analysis of solubility curves for both water and carbon dioxide allows estimation of their partial molar volumes in silicate liquids (Spera and Bergman, Cited by: Thermodynamic evaluation of Sr-containing Si metals and silicate melts for Si-Sr alloy production King, and Kanda () is shown in Figure 3.

These three binary subsystems, together with the Sr-Fe. The purpose of this paper is to review both the available data and some concepts needed to begin to understand silicate melt thermodynamics. Although thermodynamics can be treated as a purely phenomenological subject dealing with bulk properties, much additional useful insight can be gained by correlating thermodynamic properties with structure Cited by: 9.

Structural ordering in melts may strongly affect the composition of partial melts in equilibrium with solids, increasing the silica composition of partial melts as a result. With increasing chemical order, the configurational entropy decreases, which can be correlated to an increase in viscosity of by:   Zaitsev et al.

used Knudsen effusion mass spectrometry to determine and activities in the melt as a function of composition and temperature, as well as thermodynamic functions for the melt and of solid silicates at high-temperature.

These investigators also provide a thorough comparison of their results with the available data in the literature. Chapters by Navrotsky and by Hess consider the thermodynamic properties and mixing relations in simple and multicomponent aluminosilicate melts, both from a fundamental structural point of view and empirical chemical models which can be conveniently extrapolated to natural systems.

High-temperature Raman spectroscopy was applied to study model silicate melts in the M2O-SiO2 system, where M = K, Na, or Li. Structural units of the melts and equilibrium constants of reactions.

Vapor pressure and vapor fractionation of silicate melts of tektite composition. Geochimica et Cosmochimica Acta28 (6), DOI: /(64) K.A Gschneidner, J.T Waber. Concerning the evidence for the existence of the high-temperature γ' phase of cerium. Thermodynamic properties of quartz, cristobalite and amorphous Si0 2: Drop calorimetry measurements between and K and a review from 0 to K.

Geochim. Cosmochim. Cosmochim. Acta 46. For a silicate melt activity model, we have employed an ideal solution model to test the algorithm and configuration.

The energy minimization algorithm and melt thermodynamic model were applied to the SiO 2 –Al 2 O 3 –FeO–Fe 3 O 4 –MgO–CaO system, consisting of olivine, cpx, opx, spinel, and silicate melt at 1 GPa. Calculated phase. Thermodynamics of Minerals and Melts - Ebook written by R.C.

Newton, A. Navrotsky, B.J. Wood. Read this book using Google Play Books app on your PC, android, iOS devices. Download for offline reading, highlight, bookmark or take notes while you read Thermodynamics of Minerals and Melts.

where S T is an unknown function of X, the melt composition, the temperatures T 0 and T, and other parameters 6,8,9,10,11,If S T were a constant. Multiphase flow (melt + crystals + bubbles) plays a particularly important role in the evolution of magma chambers.

The large density differences between melt and discrete phases such as bubbles and crystals, and the resulting flow fields generated by buoyancy are shown to be an efficient mechanism to generate mixing in chamber systems. Purchase Silica Glass and Its Application - 1st Edition.

Print Book & E-Book. ISBN1 Introduction. Silicate melts have played a crucial role in petrologic and geodynamic processes throughout Earth's history.

The terrestrial magma ocean has likely facilitated the separation of the metallic core and the silicate mantle [Elkins‐Tanton, ].On the modern Earth, new oceanic crust is continuously formed through melting of the upper mantle along mid‐ocean ridges, while. Purchase Treatise on Process Metallurgy, Volume 1: Process Fundamentals - 1st Edition.

Print Book & E-Book. ISBN  Melting Points of Iron Oxides on Silica; Phase Equilibria in the System Fe-Si-O as a Function of Gas Composition and Temperature L. Darken Cite this: J. Chem. Soc.70. The enthalpies of mixing between the coatings and the molten silicate are less exothermic for Yb 2 Si 2 O 7 and CaYb 4 Si 3 O 13 than for 7YSZ, indicating lower energetic stability of the latter against molten silicate corrosion.

The thermochemical results explain and support the very corrosive nature of CMAS melts in contact with ceramic coatings. This book summarizes the experimental evidence and modern classical and theoretical approaches in understanding the vitreous state, from structural problems, over equilibrium and non-equilibrium thermodynamics, to statistical physics.

Glasses, and especially silicate glasses, are only the best. Thus, several chemical and thermodynamic principles argue against Klemme's interpretations: Ca- and F-dominated liquids do not form glasses; the fluoride-silicate immiscibility does not exist in multicomponent peridotite or basaltic systems; the formation of fluorine-rich melts in subduction zones is unlikely due to the fluorite crystallization and buffering, and hence the analyzed “liquids.Our recently developed model to describe the viscosity of binary silicate melts is extended to describe and predict the viscosities of multicomponent silicate melts.

The viscosity of multicomponent melts containing no AlO is modeled to vary linearly as a function of the mole fractions of the basic oxides at constant SiO 2 mole fraction.W. M. W h i t e G e o c h e m i s t r y vii Novem Problems