Structure et conductivite electrique de verres appartenant au systeme Li2Si2O5 Li2SO4

Kone, A.; Barrau, B.; Souquet, J.L.; Ribes, M.

doi:10.1016/0025-5408(79)90105-3

Cited by 25 publications

(5 citation statements)

References 6 publications

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“…It should be noticed that in these glasses, was detected, by Raman spectroscopy, the presence of niobium ions inserted in the glass matrix as network modifiers [13]. On the other hand the high resistivity of the LiNbO 3 crystalline phase [1], and the Li 2 Si 2 O 5 crystalline phase conductivity (r $ 10 À12 S/m [21]) at room temperature, will increase the glass-ceramic resistivity. However, the observed decrease of the E a(dc) (Fig.…”

Section: Discussionmentioning

confidence: 95%

Electrical and dielectrical properties of SiO2–Li2O–Nb2O5 glass and glass-ceramics obtained by thermoelectric treatments

Graça

Silva

Sombra

2006

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 95%

Electrical and dielectrical properties of SiO2–Li2O–Nb2O5 glass and glass-ceramics obtained by thermoelectric treatments

Graça

Silva

Sombra

2006

Journal of Non-Crystalline Solids

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“…However, it does not show any major effect on conductivity. Examination of the effect of replacing Si by S in the system Li2Si2Os-Li2SO,L shows linear increase in conductivity with Li2SO4 content (Kone et al 1979). High ionic conductivities are observed for a glass at the boundary of glass formation region.…”

Section: Alkali Silicate Glassesmentioning

confidence: 92%

Fast ion conducting lithium glasses—Review

1984

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For the last few years fast ion conducting lithium glasses are being studied due to their potential use in advanced electrochemical devices. A number of glass systems containing oxides, sulphides and other lithium compounds prepared by both conventional cooling and rapid quenching techniques have been reported. In this paper we review the transport properties of lithium ion conducting glasses. The special features of the ionic conduction process have been highlighted and some experimental techniques to study transport properties have been described. Some of the common observations of the properties have been discussed and finally some important problems for future development have been pointed out.

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“…The present work deals with two interconnected topics. In the first, we collect, combine, analyze, and discuss literature data (including our own) on several dynamic processes in LS 2 liquid, such as viscous flow, crystal nucleation, [30][31][32][33][34][36][37][38][39][40][41][42][43] crystal growth, [20][21][22][23][24][25][26][27][28][29][32][33][34][35][36] ionic conductivity [44][45][46][47][48][49][50][51][52][53][54][55][56][57] and ionic self-diffusion. [58][59][60][61] These processes are explored over a very wide temperature range-from temperatures slightly below the glass transition temperature, T g , up to temperatures above melting point, T m .…”

Section: Introductionmentioning

confidence: 99%

Dynamic processes in a silicate liquid from above melting to below the glass transition

Nascimento

Fokin

Zanotto

et al. 2011

The Journal of Chemical Physics

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We collect and critically analyze extensive literature data, including our own, on three important kinetic processes--viscous flow, crystal nucleation, and growth--in lithium disilicate (Li(2)O·2SiO(2)) over a wide temperature range, from above T(m) to 0.98T(g) where T(g) ≈ 727 K is the calorimetric glass transition temperature and T(m) = 1307 K, which is the melting point. We found that crystal growth mediated by screw dislocations is the most likely growth mechanism in this system. We then calculated the diffusion coefficients controlling crystal growth, D(eff)(U), and completed the analyses by looking at the ionic diffusion coefficients of Li(+1), O(2-), and Si(4+) estimated from experiments and molecular dynamic simulations. These values were then employed to estimate the effective volume diffusion coefficients, D(eff)(V), resulting from their combination within a hypothetical Li(2)Si(2)O(5) "molecule". The similarity of the temperature dependencies of 1/η, where η is shear viscosity, and D(eff)(V) corroborates the validity of the Stokes-Einstein/Eyring equation (SEE) at high temperatures around T(m). Using the equality of D(eff)(V) and D(eff)(η), we estimated the jump distance λ ~ 2.70 Å from the SEE equation and showed that the values of D(eff)(U) have the same temperature dependence but exceed D(eff)(η) by about eightfold. The difference between D(eff)(η) and D(eff)(U) indicates that the former determines the process of mass transport in the bulk whereas the latter relates to the mobility of the structural units on the crystal/liquid interface. We then employed the values of η(T) reduced by eightfold to calculate the growth rates U(T). The resultant U(T) curve is consistent with experimental data until the temperature decreases to a decoupling temperature T(d)(U) ≈ 1.1-1.2T(g), when D(eff)(η) begins decrease with decreasing temperature faster than D(eff)(U). A similar decoupling occurs between D(eff)(η) and D(eff)(τ) (estimated from nucleation time-lags) but at a lower temperatureT(d)(τ) ≈ T(g). For T > T(g) the values of D(eff)(τ) exceed D(eff)(η) only by twofold. The different behaviors of D(eff)(τ)(T) and D(eff)(U)(T) are likely caused by differences in the mechanisms of critical nuclei formation. Therefore, we have shown that at low undercoolings, viscosity data can be employed for quantitative analyses of crystal growth rates, but in the deeply supercooled liquid state, mass transport for crystal nucleation and growth are not controlled by viscosity. The origin of decoupling is assigned to spatially dynamic heterogeneity in glass-forming melts.

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Structure et conductivite electrique de verres appartenant au systeme Li2Si2O5 Li2SO4

Cited by 25 publications

References 6 publications

Electrical and dielectrical properties of SiO2–Li2O–Nb2O5 glass and glass-ceramics obtained by thermoelectric treatments

Electrical and dielectrical properties of SiO2–Li2O–Nb2O5 glass and glass-ceramics obtained by thermoelectric treatments

Fast ion conducting lithium glasses—Review

Dynamic processes in a silicate liquid from above melting to below the glass transition

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