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dc.contributor.authorVIJ, JAGDISH KUMAR
dc.date.accessioned2010-03-12T15:57:38Z
dc.date.available2010-03-12T15:57:38Z
dc.date.issued2002
dc.date.submitted2002en
dc.identifier.citationGP. Johari, G. Power and J. K. Vij, Localized relaxation in a glass and the minimum in its orientational polarization contribution, Journal of Chemical Physics, 117, 2002, 1714 - 1722en
dc.identifier.otherY
dc.identifier.urihttp://hdl.handle.net/2262/38834
dc.descriptionPUBLISHEDen
dc.description.abstractThe dielectric permittivity and loss spectra of the glassy state of 5-methyl-2-hexanol obtained by quenching it from the liquid state has been studied. In one experiment, the spectra were studied at different temperatures as the quenched sample was heated at 0.1 K/min from 105.3 to 160.5 K. In the second experiment, the quenched sample was heated from 77 to 131.6 K and kept at that temperature for 14.6 ks. The relaxation rate, fm,?, the dielectric relaxation strength, ???, and the distribution of relaxation time parameters, ? and ?, for the Johari?Goldstein process were determined. The parameter ? was found to be equal to 1 and independent of both the temperature and time, ??? initially decreased on increasing the temperature, reached a minimum value at ~145.6 K, and then increased. The plot of fm,? against the reciprocal temperature decreased in slope and at ~140 K became linear. This indicates that fm,? increases on structural relaxation. In the course of the annealing at 131.6 K, ??? of the quenched sample decreased with time, approaching a plateau value. It is described by an equation, ???(t) = ???(t??)+[???(t = 0)????(t??)]exp[?(t/?)], where t is the time, and ? (=3.5 ks) is the characteristic time. It is pointed out that contrary to the earlier finding, o-terphenyl shows a ? relaxation in the equilibrium liquid state. A consideration of dielectric permittivity arising from small-angle motions of all molecules, which has been suggested as an alternative mechanism for the localized motions seen as ? relaxation, indicates that this mechanism is inconsistent with the known increase in the equilibrium permittivity on cooling.en
dc.format.extent1714en
dc.format.extent1722en
dc.language.isoenen
dc.publisherAmerican Institute of Physicsen
dc.relation.ispartofseriesJournal of Chemical Physics;
dc.relation.ispartofseries117;
dc.rightsYen
dc.subjectElectronic & Electrical Engineering
dc.titleLocalized relaxation in a glass and the minimum in its orientational polarization contributionen
dc.typeJournal Articleen
dc.contributor.sponsorEnterprise Irelanden
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/jvij
dc.identifier.rssinternalid24408
dc.identifier.rssurihttp://dx.doi.org/10.1063/1.1485960en


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