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1、REPORTSingbeforethenextcyclestarts(Fig.2B).The17.M.Grimsditch,Phys.Rev.Lett.52,2379(1984).exothermisparameterizedfromthemeasuredpyrometerandvideobrightnessfluctuations18.P.F.McMillan,M.Wilson,D.Daisenberger,D.Machon,temperaturelimitsshowninFig.2B,theonsetoftheNat.Mater.4,680(2005).equivalentLD
2、L/HDLendothermbeingoffsetby250ms(SOM),however,canalsobeattributedinpart19.A.DiCiccoetal.,HighPressureRes.24,93(2004).fromtheriseoftheinitialHDL/LDLexothermthattovariationsinemissivityoverthesurface,adding20.G.N.Greaves,F.Meneau,O.Majérus,D.G.Jones,startsthecycle.Theresultingoscillatingtemperat
3、uressomeuncertaintytothetemperaturesrecordedbyJ.Taylor,Science308,1299(2005).areshownbythedashedbluecurvewiththeemitted/thepyrometer.Nevertheless,takingthemeasured21.S.Sastry,C.A.Angell,Nat.Mater.2,739(2003).absorbedpowersyieldingavaluefortheenthalpyDHLL22.Y.Katayamaetal.,Nature403,170(2000).o
4、fthepolyamorphictransitionof34T8kJ/mol.temperaturelimitsfromFig.2B,afigureforthe23.Y.Katayamaetal.,Science306,848(2004).35.Ifaluminaoryttrium-aluminum-garnetnucleatedinsteadenthalpychangeDHLLassociatedwiththepoly-24.S.Aasland,P.F.McMillan,Nature369,633(1994).ofLDL,ashasbeenproposedbysomeresear
5、chersamorphictransitionof34T8kJ/molisobtained25.J.K.Weberetal.,J.Am.Ceram.Soc.83,1868(2000).(27–29),theexothermwouldbeduetoDSfusion,−1−1−1−1(34),similartothecalorimetricvaluereportedfrom26.M.C.Wilding,P.F.McMillan,J.Non-Cryst.Solidswhichequals48kJmolKand30kJmolK,reheatingquenchedglasses(26).29
6、3–295,357(2001).respectively,comparedwiththeDSLLvalueof−1−127.K.Nagashio,K.Kuribayashi,J.Am.Ceram.Soc.85,235319T4kJmolKmeasuredintheseinsituThecriticaltemperatureforthetwo-state(2002).experiments.Also,Dr/r>0,whichwouldnotmodel(8),whichisdefinedbyDH/2R(whereRis28.J.A.Tangeman,B.L.Phillips,R.Har
7、t,J.Am.Ceram.Soc.destabilizetherotoraction(Fig.2BandmoviesS1thegasconstant),is2030T480K.Moreover,the90,758(2007).andS2).HDL/LDLdecreaseinentropyDS=DH/T29.L.B.Skinner,A.C.Barnes,P.S.Salmon,W.A.Chrichton,36.Themeasuredtemperatureriseatthe
