Thermodynamics of Silicates

Babushkin, V. I.; Matveev, G. M.; Mchedlov-Petrosi︠a︡n, O. P.

doi:10.1007/978-3-642-69320-5

Cited by 188 publications

(143 citation statements)

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“…This expression ®ts the experimental data [28] well in the temperature range 693±758 K. Thermodynamic and viscosity data were taken from [29,30]. The following Fulcher equation was employed to describe the viscosity of L2S glass: log gY Pa s À7X52 6259a T À 406 Y T K .…”

Section: Calculations and Resultsmentioning

confidence: 99%

Crystal nucleation in silicate glasses: the temperature and size dependence of crystal/liquid surface energy

Fokin

Zanotto

2000

Journal of Non-Crystalline Solids

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The most basic assumption of the classical nucleation theory (CNT) is to treat nucleus/liquid surface energy, r, as a macroscopic property having a value equal to that of a planar interface, r I . Therefore, when the CNT is used to analyze experimental data, the size dependence of surface energy is often neglected. To date, there has been no reliable method to measure the surface energy of the nucleus/liquid interface except by ®tting nucleation rate data to the theory. In this case, one obtains the surface energy of critical size nuclei as a function of temperature. However, the ®tted r(T) dependence arises from two di erent factors: the temperature dependence of r for a planar interface and its size dependence. This paper focuses on the temperature dependence of the macroscopic value of surface energy, decoupling it from the size dependent part. TolmanÕs equation was used to eliminate the size dependence of surface energy from published nucleation data for two stoichiometric silicate glasses (Li 2 O á 2SiO 2 and Na 2 O á 2CaO á 3SiO 2 ). It is shown that the Tolman parameter may be chosen so that surface tension decreases with temperature; dr I adT`0. The value of dr I adT obtained in this way is close to theoretical predictions. Ó

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Section: Calculations and Resultsmentioning

confidence: 99%

Crystal nucleation in silicate glasses: the temperature and size dependence of crystal/liquid surface energy

Fokin

Zanotto

2000

Journal of Non-Crystalline Solids

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“…Thermodynamic analysis makes it possible to determine direction and duration of the course of reactions, stability of the formed compounds and ways of suppressing undesirable directivity of the processes [15].…”

Section: Methods Of Thermodynamic Analytical Studiesmentioning

confidence: 99%

“…Significant contribution to the development of theory of silicate systems was made by scientists from Kharkov [14,15]. The known methods of thermodynamics are developed with their participation.…”

Section: Theoretical and Experimental Research Into Manufacturing Of mentioning

confidence: 99%

Theoretical and experimental research into manufacturing of silicate products without thermal treatment

Vinnichenko

Krot

Vitsenko

2016

EEJET

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“…One can also represent the part of a phase diagram that pertains to Table I) into account. The useful thermodynamic data were found in various bibliographical sources: [5] for the CSH minerals, [6] for portlandite, amorphous silica, ettringite, and calcium monosulfoaluminate, [7] for calcite. The choice of thermodynamic data is discussed in [2].…”

Section: Methodsmentioning

confidence: 99%

Use of thermodynamic chemical potential diagrams (µCaO, µCO2) to understand the weathering of cement by a slightly carbonated water

2008

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Cement is a ubiquitous material that may suffer hazardous weathering. The chemical weathering of cement in natural environment is mostly characterized by the leaching of CaO and the addition of CO 2 . The different weathering zones that develop at the expense of the cement may be predicted by the help of chemical potential phase diagrams; these diagrams simulate the behaviour of systems open to some chemical elements. Some components have a so-called inert status, that is to say the system is closed for these components, their amount in the system remains constant; some other components have a mobile status, that is to say these components can be exchanged with the outside of the system, their amount can vary from one sample zone to another. The mobile components are represented in the model by their chemical potentials (linked to their concentrations) that are variable in the external environment. The main features of the weathering of a cement system open to CaO and CO 2 are predicted in a phase diagram with µCaO et µCO 2 as diagram axes. From core to rim, one observes the disappearance of portlandite, ettringite and calcium monosulfoaluminate, the precipitation of calcite and amorphous silica, the modification of the composition of the CSH minerals (hydrated calcium silicates) that see a decrease of their c/s ratio (CaO/SiO 2 ) from the core to the rim of the sample. For the CSH minerals, we have separated their continuous solid solution into three compositions defined by different CaO/SiO 2 ratios and called phases 1, 2 and 3: CaO = 0.8, 1.1, 1.8 respectively for one mole of SiO 2 knowing that H 2 O varies in the three compositions.

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Thermodynamics of Silicates

Cited by 188 publications

References 0 publications

Crystal nucleation in silicate glasses: the temperature and size dependence of crystal/liquid surface energy

Crystal nucleation in silicate glasses: the temperature and size dependence of crystal/liquid surface energy

Theoretical and experimental research into manufacturing of silicate products without thermal treatment

Use of thermodynamic chemical potential diagrams (µCaO, µCO2) to understand the weathering of cement by a slightly carbonated water

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