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1、ARTICLEReceived14Dec2013
2、Accepted10Jan2014
3、Published3Feb2014DOI:10.1038/ncomms4238StructuraloriginsofJohari-GoldsteinrelaxationinametallicglassY.H.Liu1,*,T.Fujita1,*,D.P.B.Aji1,*,M.Matsuura2&M.W.Chen1,3Johari-Goldsteinorbrelaxation,persistingdowntoglassystatefromasu
4、percooledliquid,isauniversalphenomenonofglassydynamics.Nevertheless,theunderlyingmicromechanismsleadingtotherelaxationarestillindebatedespitegreateffortsdevotedtothisproblemfordecades.HerewereportexperimentalevidenceonthestructuraloriginsofJohari-Goldsteinrelaxation
5、inanultra-quenchedmetallicglass.Themeasuredactivationenergyoftherelaxation(B26timesoftheproductofgasconstantandglasstransitiontemperature)isconsistentwiththedynamiccharacteristicsofJohari-Goldsteinrelaxation.SynchrotronX-rayinvestigationsdemonstratethattherelaxation
6、originatesfromshort-rangecollectiverear-rangementsoflargesolventatoms,whichcanberealizedbylocalcooperativebondingswitch.OurobservationsprovideexperimentalinsightsintotheatomicmechanismsofJohari-Goldsteinrelaxationandwillbehelpfulinunderstandingthelow-temperaturedyna
7、micsandpropertiesofmetallicglasses.1WPIAdvancedInstituteforMaterialsResearch,TohokuUniversity,Sendai980-8577,Japan.2InstituteforMaterialsResearch,TohokuUniversity,Sendai980-8577,Japan.3StateKeyLaboratoryofMetalMatrixComposites,SchoolofMaterialsScienceandEngineering,
8、ShanghaiJiaoTongUniversity,Shanghai200030,China.*Theseauthorscontributedequallytothiswork.CorrespondenceandrequestsformaterialsshouldbeaddressedtoM.W.C.(email:mwchen@wpi-aimr.tohoku.ac.jp).NATURECOMMUNICATIONS
9、5:3238
10、DOI:10.1038/ncomms4238
11、www.nature.com/naturecommu
12、nications1&2014MacmillanPublishersLimited.Allrightsreserved.ARTICLENATURECOMMUNICATIONS
13、DOI:10.1038/ncomms4238ohari-Goldstein(JG)relaxationhasintrinsiccorrelationwithareessentiallyassociatedwithstructureofmetallicglasses,directlyglasstransitionandmanyfundamentalprop
14、ertiesofglassyinvestigatingthecorrelationbetweenatomicstructureandJGJmaterials1–5.Itisgenerallyexplainedintermofhinderedrelaxationmaysheda
