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Titolo:
FAST RELAXATION IN A FRAGILE LIQUID UNDER PRESSURE
Autore:
TOLLE A; SCHOBER H; WUTTKE J; RANDL OG; FUJARA F;
Indirizzi:
INST MAX VON LAUE PAUL LANGEVIN F-38042 GRENOBLE FRANCE UNIV DORTMUND,FACHBEREICH PHYS D-44221 DORTMUND GERMANY TECH UNIV MUNICH,DEPT PHYS D-85747 GARCHING GERMANY
Titolo Testata:
Physical review letters
fascicolo: 11, volume: 80, anno: 1998,
pagine: 2374 - 2377
SICI:
0031-9007(1998)80:11<2374:FRIAFL>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPERCOOLED ORTHO-TERPHENYL; GLASS-TRANSITION; DIELECTRIC-RELAXATION; TEMPERATURE-DEPENDENCE; NEUTRON-SCATTERING; MOLECULAR-DYNAMICS; ORTHOTERPHENYL; PHTHALATE; FORMER; ALLOYS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
A. Tolle et al., "FAST RELAXATION IN A FRAGILE LIQUID UNDER PRESSURE", Physical review letters, 80(11), 1998, pp. 2374-2377

Abstract

The incoherent dynamic structure factor of orthoterphenyl is studied by quasielastic neutron scattering to 240 MPa. Tagged-particle correlations in the compressed liquid decay in two steps. The alpha-relaxation line shape is independent of pressure, and the relaxation time proportional to viscosity. A kink in the amplitude f(Q)(P) reveals the onset of beta relaxation. The beta-relaxation regime can be described by the mode-coupling scaling function; amplitudes and time scales allow a consistent determination of the critical pressure P-c(T). alpha and beta relaxation depend in the same way on the thermodynamic state; closeto P-c(T), this dependence can be parametrized by an effective coupling Gamma proportional to nT(-1/4).

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Documento generato il 04/07/20 alle ore 04:28:40