Modelling configurational entropy of silicate melts

Russell, James K.; Giordano, Daniele

doi:10.1016/j.chemgeo.2016.07.019

Cited by 17 publications

(22 citation statements)

References 37 publications

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“…In recent years, the degree of polymerization of silicate melts and glasses, frequently expressed by the SM and NBO/T parameters, has been shown to be strongly correlated to physical properties (e.g., viscosity, heat capacity, fictive temperature, and configurational entropy). [17,26,27,20,46,47] In this study, we have shown that Raman ratio is strongly correlated to NBO/T and SM parameters, demonstrating that results from any spectrometer can potentially be correlated via a simple normalization procedure applied to Raman spectral intensity ratios (i.e., R = I LW /I HW ).…”

Section: Raman-based Models For Silicate Melts Viscositymentioning

confidence: 79%

“…The method proposed here for retrieving the viscosity of silicate melts is straightforward and can be used on all glasses, melts, and multiphase materials (e.g., characteristic of lavas to those employed in industrial processes) and allows for predicting ancillary transport (i.e., fragility) and thermodynamic (i.e., glass transition temperatures, configurational heat capacities, and entropies) properties. [17,47,55,56] The relative ease with which Raman spectra can be collected in the laboratory, in the field, or remotely suggests many diverse applications in the Earth, planetary, and industrial sciences. [57] Raman measurements involve relatively straightforward sample preparation.…”

Section: Discussionmentioning

confidence: 99%

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A calibrated database of Raman spectra for natural silicate glasses: implications for modelling melt physical properties

Giordano

González-García

Russell

et al. 2019

J Raman Spectroscopy

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The physical properties of silicate melts are of critical importance for understanding magmatic and volcanic processes on Earth and other planets. Most physical properties of melts are, ultimately, a consequence of the structural organization of the melt. Robust and fully generalizable strategies for the prediction of properties of naturally occurring melts as functions of composition, temperature, and pressure remain a challenging goal. Given the structural origin of macroscopic properties, Raman spectroscopy of glasses, which provides information on melt and glass structure, may provide a useful technique to understanding and quantify variations in macroscopic melt properties. Here, with the aim of providing a generalizable model for predicting the viscosity of silicate melts, we present the results of a Raman spectroscopy campaign performed on 30 anhydrous multicomponent silicate glasses resulting from quenching of remelted and homogenized volcanic rocks and synthetic equivalents. The sample suite comprises one of the largest databases of multicomponent melts for which (a) chemical compositions and (b) physical properties (i.e., viscosity, fragility, heat capacity, and glass transition temperature) are known. Raman spectra have been collected using green light sources at wavelengths of 532 nm. Spectra were collected on the same sample suite in four independent laboratories involving instruments from different manufacturers and, thus, using different spectrometers, detectors, and analytical conditions. Our results are also compared and integrated with published data on some of the same samples derived from two others setups using green light sources with 514.5 and 532 nm wavelegths. For the same sample, the Raman spectra acquired using different setups show different intensities and intensity ratios. However, a strategy based on the ratio between the low‐ and high‐wavenumber peaks (R) was developed to standardize the data to normalized Raman ratios (Rn) and thus to remove interlaboratory differences. Using these advances, we predict melt viscosity solely with the use of Raman spectral measurements of multicomponent silicate glasses, thus demonstrating the potential of the method in describing physical properties of silicate melts.

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Section: Raman-based Models For Silicate Melts Viscositymentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

A calibrated database of Raman spectra for natural silicate glasses: implications for modelling melt physical properties

Giordano

González-García

Russell

et al. 2019

J Raman Spectroscopy

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“…Determining the heat capacities of all of the melts (c pl ) is not possible due to crystallisation during the measurements. Therefore, c pl and C p conf are modelled after Giordano and Russell (2017) and Russel and Giordano (2017) as discussed below.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Rheology of melts from the colli albani volcanic district (Italy): a case study

Kleest

Webb

Fanara

2020

Contrib Mineral Petrol

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In this study the first viscosity measurements in the glass transition range of melts from highly explosive large-volume eruptions from the Colli Albani Volcanic District (CAVD) are presented. The magmas are ultrapotassic, rich in iron and CaO and characterised by a low silica content (< 45 wt%). Melt compositions range from tephri-phonolitic to foiditic. The Colli Albani eruptions appear anomalous since they produced a large volume of erupted material in spite of their silica undersaturated compositions. The viscosity of the Colli Albani melt changes as the melt composition evolves from the original melt to a country-rock contaminated melt to a crystal-bearing melt with a permanent decrease in liquid viscosity. Conventional estimations of viscosities assume these magmas to have a low viscosity. The presented data show that the melt viscosities are higher than expected. Taking into account further chemical or rheological features of a melt, the investigated CAVD melts are not that striking as assumed in comparison with other large-volume eruptions. Consequently, considering the alkaline-earth to alkaline ratio together with the SiO2 content could provide an alternative when comparing large volume eruptions.

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“…the rate at which viscosity varies with temperature, that is an in− dication of melts capacity to store energy), the calorimetric properties (configurational entropy, S conf and the config− urational heat capacity C p conf ; see Equation A2.4) [e.g. Gior− dano and Dingwell, 2003a;Giordano et al, 2008b;Chevrel et al, 2013;Giordano and Russell, 2017;Russell and Giordano, 2017] Angell, 1991;Giordano and Dingwell, 2003] ( Figures 1,2). Russell et al [2003], in agreement with ear− ly theoretical studies [e.g.…”

Section: T -Dependent Models For Predicting Melt Viscositymentioning

confidence: 99%

“…These properties play crucial roles at micro− to macroscopic scale and many are correlated, in a non−lin− ear manner [e.g. Richet et al, 1984;Giordano et al, 2008a;Russell and Giordano, 2017].…”

Section: Introductionmentioning

confidence: 99%

Advances in the rheology of natural multiphase silicate melts: Import for magma transport and lava flow emplacement

Giordano

2019

Annals of Geophysics

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A review of recent advances in the field of rheology of multicomponent silicate melts and multiphase silicate melt and multiphase silicate melt and analogue material suspensions is presented. is presented here. The advances include the development of new experimental de− vices and field and remote sensing methods for measuring the rheological properties of natural melts and magmas as well as new mod− elling strategies. These promising approaches combine laboratory experiments, theoretical models, numerical simulations and remote sens− ing data derived from ground, airborne and satellite−based tools. Each of these sub−disciplines has evolved rapidly in recent years and the growing range of complementary data appears now to provide an opportunity for the development of multi−disciplinary research. Ul− timately, these multidisciplinary initiatives seek to provide near−real−time forecasting of hazardous volcanic processes such as lava flow field evolution. The results and approaches described here focus on multiphase (i.e. melts, bubbles, crystals) rheology of natural systems and are pertinent to the effusive emplacement of lavas, dykes and sills, as well as, to the eruption dynamics attending explosive eruptions.

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Modelling configurational entropy of silicate melts

Cited by 17 publications

References 37 publications

A calibrated database of Raman spectra for natural silicate glasses: implications for modelling melt physical properties

A calibrated database of Raman spectra for natural silicate glasses: implications for modelling melt physical properties

Rheology of melts from the colli albani volcanic district (Italy): a case study

Advances in the rheology of natural multiphase silicate melts: Import for magma transport and lava flow emplacement

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