Dynamics of mobile ions in inorganic glasses

Cramer, Cornelia; Brückner, S.; Gao, Ying; Funke, K.; Belin, Renaud C.; Taillades, Gilles; Pradel, Annie

doi:10.1016/s0022-3093(02)01544-2

Cited by 20 publications

(20 citation statements)

References 29 publications

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“…As shown in Fig.13 the subtraction of w local (t) from w(t) yields a plateau-like region for short times. This is in agreement with recent work on amorphous 0.5 Ag 2 S -0.5 GeS 2 [8]. Of course, for experimental data it is not possible to determine the vibrational contribution individually.…”

Section: Discussion and Summarysupporting

confidence: 91%

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Characterization of the complex ion dynamics in lithium silicate glasses via computer simulations

Heuer¹,

Kunow²,

Vogel³

et al. 2002

Phys. Chem. Chem. Phys.

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We present results of molecular dynamics simulations on lithium metasilicate over a broad range of temperatures for which the silicate network is frozen in but the lithium ions can still be equilibrated. The lithium dynamics is studied via the analysis of different correlation functions. The activation energy for the lithium mobility agrees very well with experimental data. The correlation of the dynamics of adjacent ions is weak. At low temperatures the dynamics can be separated into local vibrational dynamics and hopping events between adjacent lithium sites. The derivative of the mean square displacement displays several characteristic time regimes. They can be directly mapped onto respective frequency regimes for the conductivity. In particular it is possible to identify time regimes dominated by localized dynamics and longrange dynamics, respectively. The question of time-temperature superposition is discussed for the mean square displacement and the incoherent scattering function.

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Section: Discussion and Summarysupporting

confidence: 91%

“…σ(ν) = σ d.c. . A possible interpretation of this behavior relates these frequency regimes to local vibrations, stochastic localized dynamics, and jump dynamics, respectively [8]. An important observation for the frequency-dependent conductivity σ(ν) is the validity of the time-temperature superposition principle.…”

mentioning

confidence: 96%

Characterization of the complex ion dynamics in lithium silicate glasses via computer simulations

Heuer¹,

Kunow²,

Vogel³

et al. 2002

Phys. Chem. Chem. Phys.

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show abstract

“…5 for a silver thiogermanate glass at 273 K. In Fig. 6 a), which is a log-log plot of σT vs. frequency, this isotherm is complemented by others for the same glass [39,40]. An analysis of the temperature dependences of the limiting conductivities at low and high frequencies, σ DC and σ HF , shows that both are Arrhenius activated, the activation energy for σ DC being larger than the one Fig.…”

Section: Experimental Spectra Revisitedmentioning

confidence: 87%

“…Compared with an ionic crystal, the "vibrational" conductivity component observed in a glass is, therefore, much broader, extending to lower frequencies. Figure 5 shows the example of a silver thiogermanate glass [39,40]. In this log-log representation of the total (ionic) conductivity, σ (ν), the contribution due to vibrations is seen to have a slope of two on its low-frequency flank, which is known to be the usual behaviour in ionic solids [41].…”

Section: Conductivity Components At Low and High Frequenciesmentioning

confidence: 99%

“…Frequency-dependent conductivities, permittivities and dielectric moduli of binary ion-conducting glasses. a) Complete conductivity isotherms with HF plateau resolved, for Ag 2 S·GeS 2 glass [39,40]; b) high-precision conductivity isotherms of 0.3 Li 2 O·0.7 B 2 O 3 glass in the impedance frequency regime [10]; c) permittivity isotherms in 0.2 Na 2 O·0.8 GeO 2 glass in the impedance regime [20,27]; d) scaled permittivities for the same glass as in c), as per Eq. (4) [20,27]; e) and f) are isotherms of the real and imaginary part of the dielectric modulus for the same glass as in c).…”

Section: Experimental Spectra Revisitedmentioning

confidence: 99%

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