Phonon-like dynamics in glasses: Coupling between damping and fragility

Livia E. Bove; C. Petrillo; A. Fontana; A. Ivanov; C. Dreyfus; A. P. Sokolov

doi:10.1016/j.physb.2006.05.090

Phonon-like dynamics in glasses: Coupling between damping and fragility

Livia E. Bove, C. Petrillo, A. Fontana, A. Ivanov, C. Dreyfus, A. P. Sokolov

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4 Scopus citations

Abstract

The high-frequency dynamics of two strong glasses, v-GeO₂ and v-ZnCl₂, were studied by means of inelastic neutron scattering experiments carried out with three triple-axis spectrometers in order to selectively access either a wide kinematic region or a high-energy resolution. The experimental spectra show well-defined dispersive acoustic excitations coexisting with non-dispersive waves. A thorough analysis of the inelastic line shape of longitudinal acoustic excitations provides estimates of the damping factors, which can be compared to the results of several earlier inelastic X-ray estimates for a wide class of inorganic glasses. A striking relation is observed between the microscopic damping of phonon-like modes in these glasses well below T_g and the fragility of the supercooled liquids approaching the glass transition, thus suggesting new means of investigation of the glass transition phenomenology.

Original language	English
Pages (from-to)	16-22
Number of pages	7
Journal	Physica B: Physics of Condensed Matter
Volume	385-386 I
DOIs	https://doi.org/10.1016/j.physb.2006.05.090
State	Published - Nov 27 2006
Externally published	Yes

Keywords

Dynamics
Glasses
Neutron scattering

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10.1016/j.physb.2006.05.090

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title = "Phonon-like dynamics in glasses: Coupling between damping and fragility",

abstract = "The high-frequency dynamics of two strong glasses, v-GeO2 and v-ZnCl2, were studied by means of inelastic neutron scattering experiments carried out with three triple-axis spectrometers in order to selectively access either a wide kinematic region or a high-energy resolution. The experimental spectra show well-defined dispersive acoustic excitations coexisting with non-dispersive waves. A thorough analysis of the inelastic line shape of longitudinal acoustic excitations provides estimates of the damping factors, which can be compared to the results of several earlier inelastic X-ray estimates for a wide class of inorganic glasses. A striking relation is observed between the microscopic damping of phonon-like modes in these glasses well below Tg and the fragility of the supercooled liquids approaching the glass transition, thus suggesting new means of investigation of the glass transition phenomenology.",

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T1 - Phonon-like dynamics in glasses

T2 - Coupling between damping and fragility

AU - Bove, Livia E.

AU - Petrillo, C.

AU - Fontana, A.

AU - Ivanov, A.

AU - Dreyfus, C.

AU - Sokolov, A. P.

PY - 2006/11/27

Y1 - 2006/11/27

N2 - The high-frequency dynamics of two strong glasses, v-GeO2 and v-ZnCl2, were studied by means of inelastic neutron scattering experiments carried out with three triple-axis spectrometers in order to selectively access either a wide kinematic region or a high-energy resolution. The experimental spectra show well-defined dispersive acoustic excitations coexisting with non-dispersive waves. A thorough analysis of the inelastic line shape of longitudinal acoustic excitations provides estimates of the damping factors, which can be compared to the results of several earlier inelastic X-ray estimates for a wide class of inorganic glasses. A striking relation is observed between the microscopic damping of phonon-like modes in these glasses well below Tg and the fragility of the supercooled liquids approaching the glass transition, thus suggesting new means of investigation of the glass transition phenomenology.

AB - The high-frequency dynamics of two strong glasses, v-GeO2 and v-ZnCl2, were studied by means of inelastic neutron scattering experiments carried out with three triple-axis spectrometers in order to selectively access either a wide kinematic region or a high-energy resolution. The experimental spectra show well-defined dispersive acoustic excitations coexisting with non-dispersive waves. A thorough analysis of the inelastic line shape of longitudinal acoustic excitations provides estimates of the damping factors, which can be compared to the results of several earlier inelastic X-ray estimates for a wide class of inorganic glasses. A striking relation is observed between the microscopic damping of phonon-like modes in these glasses well below Tg and the fragility of the supercooled liquids approaching the glass transition, thus suggesting new means of investigation of the glass transition phenomenology.

KW - Dynamics

KW - Glasses

KW - Neutron scattering

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U2 - 10.1016/j.physb.2006.05.090

DO - 10.1016/j.physb.2006.05.090

M3 - Article

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SN - 0921-4526

VL - 385-386 I

SP - 16

EP - 22

JO - Physica B: Physics of Condensed Matter

JF - Physica B: Physics of Condensed Matter

ER -

Phonon-like dynamics in glasses: Coupling between damping and fragility

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Keywords

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