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1、JournalofNon-CrystallineSolids357(2011)3230–3236ContentslistsavailableatScienceDirectJournalofNon-CrystallineSolidsjournalhomepage:www.elsevier.com/locate/jnoncrysolUnifiedapproachfordeterminingtheenthalpicfictivetemperatureofglasseswitharbitrarythermalhistoryXiaojuGuoa,b
2、,MarcelPotuzaka,JohnC.Mauroa,⁎,DouglasC.Allana,T.J.Kiczenskia,YuanzhengYueb,c,⁎⁎aScienceandTechnologyDivision,CorningIncorporated,Corning,NY14831,USAbSectionofChemistry,AalborgUniversity,DK-9000Aalborg,DenmarkcKeyLaboratoryforGlass&Ceramics,ShandongPolytechnicUniversity
3、,Jinan250353,ChinaarticleinfoabstractArticlehistory:WeproposeaunifiedroutinetodeterminetheenthalpicfictivetemperatureofaglasswitharbitrarythermalReceived7April2011historyunderisobaricconditions.ThetechniqueisvalidatedbothexperimentallyandnumericallyusingaReceivedinrevised
4、form13May2011novelapproachformodelingofglassrelaxationbehavior.ThetechniqueisapplicabletoglassesofanythermalAvailableonline14June2011history,asprovedthroughaseriesofnumericalsimulationswheretheenthalpicfictivetemperatureispreciselyknownwithinthemodel.Also,wedemonstrateth
5、attheenthalpicfictivetemperatureofaglasscanKeywords:bedeterminedatanycalorimetricscanrateinexcellentagreementwithmodeledvalues.Fictivetemperature;Glassrelaxation;©2011ElsevierB.V.Allrightsreserved.Numericalsimulation1.Introductionatlowtemperature.Inotherwords,ifaglassisb
6、roughttoatemperatureT=Tf,itwillbeinequilibrium.However,thepioneeringTheglasstransitionisakineticphenomenonwithprofoundcrossoverexperimentsofRitland[14]showedthatrelaxationstillthermodynamicconsequences[1].Asaliquidissupercooledthroughoccursunderthesecircumstances,demons
7、tratingthatT=Tfdoesnottheglasstransitionregion,itexperiencesasuccessivefreezingofitsensureequilibrationoftheglass.Narayanaswamy[15]subsequentlyconfigurationaldegreesoffreedom[2,3].Thisstructuralarrestleadstoovercamethisproblembyintroducingadditionalorderparametersinachan
8、geinsecond-orderthermodynamicpropertiessuchasheattheformofmultiplefictivetemperatures,allowingforrepresentation
