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1、ARTICLEINPRESSPhysicaB403(2008)190–194www.elsevier.com/locate/physbThermalconductivityofsolidCHF2Cla,bO.I.Pursky,V.A.KonstantinovaT.ShevchenkoNationalUniversityofKyiv,FacultyofPhysics6,GlushkovaAve.,KyivUA-03022,UkrainebInstituteforLowTemperaturePhysicsandEngineeringof
2、NASU47,LeninAve.,KharkivUA-61103,UkraineReceived4January2007;receivedinrevisedform2July2007;accepted23August2007AbstractThethermalconductivityofsolidCHF2Clwasmeasuredatsaturatedvapourpressureintheintervalfrom80KtothemeltingtemperatureTm¼116Kbythelinear-flowmethod.Theexpe
3、rimentalresultswererecalculatedtoaconstantdensityofthesamples.ThetemperatureandvolumedependencesofthethermalconductivityofsolidCHF2Claredescribedintheframeworkofthemodel,whereheatistransferredbyphononsandabovethephononmobilityedgeby‘‘diffusive’’modes,migratingrandomlyfr
4、omsitetosite.Themobilityedgeo0isfoundfromthecondition,thatthephononmean-freepath,restrictedbytheUmklappprocesses,cannotbesmallerthanhalfthephononwavelength.r2007ElsevierB.V.Allrightsreserved.PACS:66.70.þf;63.20.LsKeywords:Thermalconductivity;Phonons;‘‘Diffusive’’modes1.
5、Introductionthevibration[6].ThethermalconductivityofmolecularcrystalapproachesitslowerlimitquitecloselyduetotheItisgenerallybelievedthatthethermalconductivityofadditionalphononscatteringcausedbytherotationalperfectdielectriccrystalsisinverselyproportionaltomotionofmolec
6、ules.temperature(L/1=T)intheintervalnearorovertheSolidfreonsofthemethaneseriesareconvenientobjectsDebyetemperatureðTXYDÞ[1,2].Foracorrectcompa-tostudytheinfluenceoftherotationalmotionofmoleculesrisonwiththeorytheisochoricdatashouldbeusedtoonheattransfer.Thecharacterofthe
7、rotationalmotionofexcludethethermalexpansioneffects[3].Surprisingly,itismoleculesvarieswidelydependingonthesubstanceandfoundthatatsaturatedvaporpressuresthethermaltemperature.Itcanchangefromsmall-anglelibrationsinconductivityofmolecularsolids,asarule,obeysthe1=Torientat
8、ionallyorderedphasestofastjump-likereorienta-law,however,theisochoricthermalconductivitydeviatestionsandtohind
