Origin of dispersion in dipolar relaxations of glasses

Ranko Richert

doi:10.1016/0009-2614(93)E1251-B

Origin of dispersion in dipolar relaxations of glasses

Ranko Richert

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Abstract

Dispersive relaxations typically found in glassy systems stem from a distribution of response times, spread either heterogeneously of homogeneously within the ensemble of sites. To distinguish between these two possibilities we follow the dynamics of dipole solvation, a technique which provides valuable insight on relaxation in both the liquid and the glassy regime. Employing the dynamic mean spherical approximation (MSA) thory, with ε{lunate}(ω) as an input, we calculate the solvation time evolution in the homogeneous and the heterogeneous limits. Due to the remarkable agreement between the homogeneous MSA and the observed solvation in 2-methyltetrahydrofuran at T_G + 3 K=94 K we conclude on the homogeneous nature of dispersion of dipolar relaxations.

Original language	English (US)
Pages (from-to)	223-227
Number of pages	5
Journal	Chemical Physics Letters
Volume	216
Issue number	1-2
DOIs	https://doi.org/10.1016/0009-2614(93)E1251-B
State	Published - Dec 24 1993
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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abstract = "Dispersive relaxations typically found in glassy systems stem from a distribution of response times, spread either heterogeneously of homogeneously within the ensemble of sites. To distinguish between these two possibilities we follow the dynamics of dipole solvation, a technique which provides valuable insight on relaxation in both the liquid and the glassy regime. Employing the dynamic mean spherical approximation (MSA) thory, with ε{lunate}(ω) as an input, we calculate the solvation time evolution in the homogeneous and the heterogeneous limits. Due to the remarkable agreement between the homogeneous MSA and the observed solvation in 2-methyltetrahydrofuran at TG + 3 K=94 K we conclude on the homogeneous nature of dispersion of dipolar relaxations.",

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AB - Dispersive relaxations typically found in glassy systems stem from a distribution of response times, spread either heterogeneously of homogeneously within the ensemble of sites. To distinguish between these two possibilities we follow the dynamics of dipole solvation, a technique which provides valuable insight on relaxation in both the liquid and the glassy regime. Employing the dynamic mean spherical approximation (MSA) thory, with ε{lunate}(ω) as an input, we calculate the solvation time evolution in the homogeneous and the heterogeneous limits. Due to the remarkable agreement between the homogeneous MSA and the observed solvation in 2-methyltetrahydrofuran at TG + 3 K=94 K we conclude on the homogeneous nature of dispersion of dipolar relaxations.

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Origin of dispersion in dipolar relaxations of glasses

Abstract

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