Ion transport anomalies in glasses

Maass, Philipp; Bunde, Armin; Ingram, Malcolm D.

doi:10.1103/physrevlett.68.3064

Cited by 304 publications

(174 citation statements)

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“…in sodium silicates the dynamics of the silicon and oxygen atoms. This is a very important issue since most of the models for the ion transport in glasses start from a coarse-grained representation of a glassy matrix which is not derived from first principles [2]. Thus the present paper is the first investigation in which the dynamics of the fast sodium ions is compared to the slow relaxation of the matrix and below we will show that these two processes are much closer related to each other than could naively be expected.…”

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confidence: 87%

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Dynamics of Sodium in Sodium Disilicate: Channel Relaxation and Sodium Diffusion

2002

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We use molecular dynamics computer simulations to study the dynamics of amorphous (Na 2 O)2(SiO 2 ). We find that the Na ions move in channels embedded in a SiO 2 matrix. The characteristic distance between these channels gives rise to a prepeak in the structure factor at around q = 0.95Å −1 . The dynamics of sodium is given by a fast process which can be seen in the incoherent scattering function and a slow process which is seen in the coherent function. The relaxation time of the latter coincides with the α−relaxation time of the matrix. The Kohlrausch exponent of the fast process for q > 1.6Å −1 is the same as the von Schweidler exponent for the slow one, demonstrating that the two processes are closely related.

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confidence: 87%

“…The dynamics of mobile ions in glasses and melts is a field of great interest in geoscience, materials science, chemistry, and physics [1,2]. However, due to the lack of experiments that probe the dynamics on a microscopic level, many details of this dynamics are not understood well.…”

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Dynamics of Sodium in Sodium Disilicate: Channel Relaxation and Sodium Diffusion

2002

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“…Several models 8,20,21 , inspired by the observations of site selectivity, feature distinct sets of adapted sites for each alkali species. Taking the site selectivity as a starting point one may ask whether the dynamics in the MA system of composition (A 2 O) a (B 2 O) b (SiO 2 ) 1−a−b can be viewed as the independent superposition of two SA systems (A 2 O) a (SiO 2 ) 1−a and (B 2 O) b (SiO 2 ) 1−b , respectively.…”

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confidence: 99%

Contributions to the mixed-alkali effect in molecular dynamics simulations of alkali silicate glasses

Lammert¹,

Heuer²

2005

Phys. Rev. B

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The mixed-alkali effect on the cation dynamics in silicate glasses is analyzed via molecular dynamics simulations. Observations suggest a description of the dynamics in terms of stable sites mostly specific to one ionic species. As main contributions to the mixed-alkali slowdown longer residence times and an increased probability of correlated backjumps are identified. The slowdown is related to the limited accessibility of foreign sites. The mismatch experienced in a foreign site is stronger and more retarding for the larger ions, the smaller ions can be temporarily accommodated. Also correlations between unlike as well as like cations are demonstrated that support cooperative behavior.

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“…Many approaches have been proposed in order to explain the transport properties of AgI-based glasses: the weak electrolyte model [12], the random site model [13], the cluster and cluster-bypass models [14][15][16], which assume the formation of AgI micro-clusters within the glass; the dynamic structure and the diffusive pathway models [17][18][19] where, in contrast, the dopant salt is assumed to be homogeneously distributed in the glass matrix; the jump diffusion model [20], which attempts at giving a microscopic interpretation of the conductivity spectra. In spite of the great variety of developed models, the full relationship between structure and dynamics at short and medium range order and ionic transport are not yet well understood.…”

Section: Introductionmentioning

confidence: 99%

Thermal behaviour of the local environment around iodine in fast-ion-conducting AgI-doped glasses

Sanson

Rocca

Fornasini

et al. 2007

Philosophical Magazine

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The local environment around iodine has been studied as a function of temperature by extended X-ray absorption fine structure (EXAFS) in fastion- conducting AgI doped glasses (borate and molybdate): silver borate glass (AgI)0.55(Ag2O:4B2O3)0.45 has been investigated from 39 to 298 K, and silver molybdate glasses (AgI)x(Ag2MoO4)1-x, with x=0.67 and x=0.75, from 25K to Tg (330–350 K). In spite of the very different character of their host matrices, these two families of glasses display a very similar local thermal behaviour around iodine: the mean distance and the coordination number of the short-range I-Ag distribution decrease when the temperature increases. These experimental results can be related to the temperature dependence of the diffusion of the silver ions, giving new elements to better understand the mechanism of ionic conduction

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Ion transport anomalies in glasses

Cited by 304 publications

References 9 publications

Dynamics of Sodium in Sodium Disilicate: Channel Relaxation and Sodium Diffusion

Dynamics of Sodium in Sodium Disilicate: Channel Relaxation and Sodium Diffusion

Contributions to the mixed-alkali effect in molecular dynamics simulations of alkali silicate glasses

Thermal behaviour of the local environment around iodine in fast-ion-conducting AgI-doped glasses

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