NDLI: Anharmonicity in a fragile glass-former probed by inelastic neutron scattering.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Plazanet, M. Schober, H.
Description	Country affiliation: Italy Author Affiliation: Plazanet M ( European Laboratory for Non-Linear Spectroscopy (LENS), University di Firenze, Sesto Fiorentino, Firenze, Italy. plazanet@ill.fr)
Abstract	Within the overall understanding of the glass transition, the relationship between microscopic dynamics and fragility is still to be clarified. Decalin is an organic glass former, for which a cis/trans mixture exhibits the highest known degree of fragility in a molecular system. It is therefore an ideal system for the investigation of microscopic dynamics in fragile systems. In the present study, the microscopic dynamics of pure cis-decalin has been measured by inelastic and quasi-elastic incoherent neutron scattering, giving the single particle self-correlation function. The fast relaxation dynamics and low-frequency vibrational modes are reported here. Both in the glass and in the crystal the vibrations show strong anharmonic behavior. In the glass phase, the short time microscopic dynamics evolve rapidly with temperature, however do not exhibit any significant change around the glass transition temperature T(g). The elastic intensity provides a measure of the mean square displacements which are comparable to those measured in other fragile glass formers, in particular, the archetypical fragile glass former orthoterphenyl. It appears that the microscopic relaxation gets unfrozen, relative to T(g), at much lower temperature than in other fragile systems.
File Format	HTM / HTML
ISSN	14639076
Issue Number	37
Volume Number	10
e-ISSN	14639084
Journal	Physical Chemistry Chemical Physics
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2008-10-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Physics Discipline Biophysics Discipline Chemistry Naphthalenes Chemistry Neutrons Crystallization Models, Chemical Phase Transition Scattering, Radiation Temperature Vibration Journal Article
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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