Nature and properties of the Johari-Goldstein β-relaxation in the equilibrium liquid state of a class of glass-formers
| dc.contributor.author | Ngai, K. L. | |
| dc.contributor.author | Lunkenheimer, P. | |
| dc.contributor.author | León Yebra, Carlos | |
| dc.contributor.author | Schneider, U. | |
| dc.contributor.author | Brand, R. | |
| dc.contributor.author | Lodl, A. | |
| dc.date.accessioned | 2023-06-20T20:07:52Z | |
| dc.date.available | 2023-06-20T20:07:52Z | |
| dc.date.issued | 2001-07-15 | |
| dc.description | © 2001 American Institute of Physics. This work was supported by the Deutsche Forschungsgemeinschaft, Grant No. LO264/8-1 and partly by the BMBF, contract No. 13N6917. The part of the work performed at the Naval Research Laboratory was supported by the Office of Naval Research. | |
| dc.description.abstract | Previous dielectric relaxation measurements of glycerol and propylene carbonate and new results on propylene glycol performed below the conventional glass transition temperatures T_(g) after long periods of aging all show that the excess wing (a second power law at higher frequencies) in the isothermal dielectric loss spectrum, develops into a shoulder. These results suggest that the excess wing, a characteristic feature of a variety of glass-formers, is the high frequency flank of a Johari–Goldstein β-relaxation loss peak submerged under the α-relaxation loss peak. With this interpretation of the excess wing assured, the dielectric spectra of all three glass-formers measured at temperatures above T_(g) are analyzed as a sum of a α-relaxation modeled by the Fourier transform of a Kohlrausch–Williams–Watts function and a β-relaxation modeled by a Cole–Cole function. Good fits to the experimental data have been achieved. In addition to the newly resolved β-relaxation on propylene glycol, the important results of this work are the properties of the β-relaxation in this class of glass-formers in the equilibrium liquid state obtained over broad frequency and temperature ranges. | |
| dc.description.department | Depto. de Estructura de la Materia, Física Térmica y Electrónica | |
| dc.description.faculty | Fac. de Ciencias Físicas | |
| dc.description.refereed | TRUE | |
| dc.description.sponsorship | Deutsche Forschungsgemeinschaft | |
| dc.description.sponsorship | BMBF | |
| dc.description.sponsorship | Office of Naval Research | |
| dc.description.status | pub | |
| dc.eprint.id | https://eprints.ucm.es/id/eprint/31104 | |
| dc.identifier.doi | 10.1063/1.1381054 | |
| dc.identifier.issn | 0021-9606 | |
| dc.identifier.officialurl | http://dx.doi.org/10.1063/1.1381054 | |
| dc.identifier.relatedurl | http://scitation.aip.org/ | |
| dc.identifier.uri | https://hdl.handle.net/20.500.14352/59632 | |
| dc.issue.number | 3 | |
| dc.journal.title | Journal of chemical physics | |
| dc.language.iso | eng | |
| dc.page.final | 1413 | |
| dc.page.initial | 1405 | |
| dc.publisher | American Institute of Physics | |
| dc.relation.projectID | LO264/8-1 | |
| dc.relation.projectID | 13N6917 | |
| dc.rights.accessRights | open access | |
| dc.subject.cdu | 537 | |
| dc.subject.keyword | Dielectric alpha-relaxation | |
| dc.subject.keyword | Supercooled liquids | |
| dc.subject.keyword | Forming liquids | |
| dc.subject.keyword | Propylene carbonate | |
| dc.subject.keyword | Secondary relaxations | |
| dc.subject.keyword | Kohlrausch exponent | |
| dc.subject.keyword | Coupling model | |
| dc.subject.keyword | Transition | |
| dc.subject.keyword | Dynamics | |
| dc.subject.keyword | Spectroscopy. | |
| dc.subject.ucm | Electricidad | |
| dc.subject.ucm | Electrónica (Física) | |
| dc.subject.unesco | 2202.03 Electricidad | |
| dc.title | Nature and properties of the Johari-Goldstein β-relaxation in the equilibrium liquid state of a class of glass-formers | |
| dc.type | journal article | |
| dc.volume.number | 115 | |
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| dspace.entity.type | Publication | |
| relation.isAuthorOfPublication | 213f0e33-39f1-4f27-a134-440d5d16a07c | |
| relation.isAuthorOfPublication.latestForDiscovery | 213f0e33-39f1-4f27-a134-440d5d16a07c |
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