Electrical conductivity of iron-bearing silicate glasses and melts. Implications for the mechanisms of iron redox reactions

Malki, M.; Magnien, V.; Pinet, O.; Richet, Pascal

doi:10.1016/j.gca.2015.05.035

Cited by 13 publications

(9 citation statements)

References 43 publications

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“…Our results on ionic conduction in the NS supercooled liquids are compatible with measured data in the glassy state, although a slight change in slope (i.e., activation energy) is obtained across the glass transition region (545 K 12 ) that is indicative of an Arrhenius crossover, in harmony with the salient phenomenology observed, e.g., in polymeric electrolytes 26,27 or simple oxides 28 or modified borosilicates. 29,30 The details of the dynamics, furthermore, suggest that the Na motion is decoupled from that of the network-forming species (Si and S) as glassy relaxation onsets and that heterogeneous dynamics takes place at intermediate times and distances below 10 Å, with complex influence from the network undergoing the glass transition phenomenon.…”

Section: Introductionsupporting

confidence: 90%

“…In addition, a moderate change in slope is observable across the glass transition region (gray zone in Figure , 545 K) that is indicative of an Arrhenius crossover. As in other glass-forming systems such as polymer electrolytes, , simple oxides, or multicomponent silicates, , conductivity is enhanced as the underlying network softens across T g . Given the set of experimental conductivity data ,, which displays some differences, it is difficult to conclude on a possible increase of σ by at least 1 order of magnitude across the glass transition region, as observed in certain borosilicates (Δσ ≃ 10 3 –10 4 Ω –1 cm –1 ), binary CaO–SiO 2 or, to a smaller extent, germanosilicates .…”

Section: Resultsmentioning

confidence: 92%

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Evidence for Complex Dynamics in Glassy Fast Ion Conductors: The Case of Sodium Thiosilicates

Sørensen,

Smedskjaer,

Micoulaut

2023

J. Phys. Chem. B

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Classical molecular dynamics is used to study the dynamics of alkali ions in a promising fast ion conductor glass system, i.e., Na2S–SiS2. Diffusion in such thiosilicates is found to display various salient features of alkali silicates, i.e., channel-like diffusion with typical length scales emerging as the temperature is decreased to the glassy state, and Arrhenius behavior for both Na ion diffusivity and calculated conductivity. The dynamics appears, however, to be largely heterogeneous as manifested by fast and slow Na ion motion at intermediate times, both in the high-temperature liquid and in the glassy state. In the former, a diffusion-limited regime is found due to the increased motion of the network-forming species that limits the Na ion dynamics, whereas at low temperatures, the typical dynamical heterogeneities are recovered as observed close to the glass transition.

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Section: Introductionsupporting

confidence: 90%

Section: Resultsmentioning

confidence: 92%

Evidence for Complex Dynamics in Glassy Fast Ion Conductors: The Case of Sodium Thiosilicates

Sørensen,

Smedskjaer,

Micoulaut

2023

J. Phys. Chem. B

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“…the migration of lithium cations depends mainly on the structural changes occurring in phosphate glass network in this region. Similar behaviour has been observed for many solids including glasses, polymers and crystals [23][24][25][26][27].…”

supporting

confidence: 81%

Influence of temperature and frequency on ionic conductivity of Li 3 PO 4 –Pb 3 (PO 4 ) 2 –BiPO 4 phosphate glasses

Moudane

Maniani

Sabbar

et al. 2015

Materials Research Bulletin

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“…17 measurements (Pommier et al, 2010;Malki et al, 2015). However, the calculated values seem to underestimate a little the conductivity of melts investigated by Presnall et al (1972), Waff and Weill (1975) and Tyburczy and Waff (1983) …”

Section: Accepted Manuscriptmentioning

confidence: 79%

Properties of magmatic liquids by molecular dynamics simulation: The example of a MORB melt

et al. 2017

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International audienceA new atom-atom interaction potential is introduced for describing by classical molecular dynamics (MD) simulation the physical properties of natural silicate melts. The equation of state, the microscopic structure, the viscosity, the electrical conductivity, and the self-diffusion coefficients of ions in a mid-oceanic ridge basalt (MORB) melt are evaluated by MD over a large range of temperature and pressure (1673-3273 K and 0-60 GPa). A detailed comparison with experimental data shows that the model reproduces the thermodynamic, structural and transport properties of a MORB with an unprecedented accuracy. In particular, it is shown that the MORB melt crystallizes at lower mantle conditions into a perovskite phase whose the equation of state (EOS) is compatible with those proposed in the experimental literature. Moreover, in accordance with experimental findings, the simulation predicts not only that the MORB viscosity exhibits a (slight) minimum with the pressure, but also that the viscosity at high temperature remains very low (<100 mPa.s for T > 2273 K) even at high pressure (up to 40 GPa). However the evolution of the electrical conductivity with temperature and pressure is not always the symmetrical of that of the viscosity. In fact, the relationship between viscosity and electrical conductivity shows a crossover at around 2073 K

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Electrical conductivity of iron-bearing silicate glasses and melts. Implications for the mechanisms of iron redox reactions

Cited by 13 publications

References 43 publications

Evidence for Complex Dynamics in Glassy Fast Ion Conductors: The Case of Sodium Thiosilicates

Evidence for Complex Dynamics in Glassy Fast Ion Conductors: The Case of Sodium Thiosilicates

Influence of temperature and frequency on ionic conductivity of Li 3 PO 4 –Pb 3 (PO 4 ) 2 –BiPO 4 phosphate glasses

Properties of magmatic liquids by molecular dynamics simulation: The example of a MORB melt

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