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Interdependence of primary and Johari-Goldstein secondary relaxations in glass-forming systems (Articolo in rivista)
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- Interdependence of primary and Johari-Goldstein secondary relaxations in glass-forming systems (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
- Alternative label
Kessairi, K; Capaccioli, S; Prevosto, D; Lucchesi, M; Sharifi, S; Rolla, PA (2008)
Interdependence of primary and Johari-Goldstein secondary relaxations in glass-forming systems
in The journal of physical chemistry. B
(literal)
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- Kessairi, K; Capaccioli, S; Prevosto, D; Lucchesi, M; Sharifi, S; Rolla, PA (literal)
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- ISI Web of Science (WOS) (literal)
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- \"Univ Pisa, Polylab CNR INFM, I-56127 Pisa, Italy; Univ Pisa, Dept Phys, I-56127 Pisa, Italy (literal)
- Titolo
- Interdependence of primary and Johari-Goldstein secondary relaxations in glass-forming systems (literal)
- Abstract
- \"We report evidence from broadband dielectric spectroscopy that the dynamics of the primary alpha- and secondary Johari-Goldstein (JG) beta-processes are strongly correlated in different glass-forming systems over a wide temperature T and pressure P range, in contrast with the widespread opinion of statistical independence of these processes. The alpha-beta mutual dependence is quantitatively confirmed by (a) the overall superposition of spectra measured at different T-P combinations but with an invariant alpha-relaxation time; (b) the contemporary scaling of the isothermal-pressure and isobaric-temperature dependences of the alpha-and beta-relaxation times as plotted versus the reduced variable T-g(P)/T where T-g is the glass transition temperature. These novel and model-independent evidences indicate the relevance of the JG relaxation phenomenon in glass transition, often overlooked by most current theories.\" (literal)
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