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硫系玻璃的微观结构、纳米相分离与晶化行为关系及微晶化可控研究.docx

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硫系玻璃的微观结构、纳米相分离与晶化行为关系及微晶化可控研究 Abstract Sulfideglasseshaveattractedmuchattentionduetotheiruniqueoptical,electrical,andmechanicalproperties.Understandingtheirmicrostructureandbehaviorisessentialforthedevelopmentofnewapplications.Inthisarticle,wediscusstherelationshipbetweenthemicrostructure,nanophaseseparation,andcrystallizationbehaviorofsulfideglasses.Wealsoexplorethepossibilitiesofcontrollingthemicrocrystallizationprocess. Introduction Sulfideglassesareinorganicglassesmainlycomposedofsulfur,chalcogenides,andmetals.Duetotheiruniqueproperties,suchashighrefractiveindex,lowphononenergy,andhighionicconductivity,theyhavebeenwidelyusedinvariousfields,suchasoptics,electronics,andenergystorage.However,theinherentstructuralcomplexityoftheseglasseshasmadethemchallengingtostudy.Recentadvancesinexperimentaltechniques,suchashigh-resolutiontransmissionelectronmicroscopy(HRTEM)andX-raydiffraction(XRD),haveprovidednewinsightsintothemicrostructureandbehavioroftheseglasses. MicrostructureandNanophaseSeparation ThestructureofsulfideglassesischaracterizedbythepresenceofanetworkformedbyS-SandS-Mbonds,whichisacombinationoftetrahedral(SP3)andtrigonalplanar(SP2)coordinationenvironments.Thedegreeofnetworkpolymerizationdependsonthecompositionandpreparationmethod.Somesulfideglassesexhibitphaseseparation,whichisthepresenceoftwoormoredistinctphaseswithdifferentcompositions.Thiscanoccurduetotheimmiscibilityofcomponentsorbytheformationofnanoscaleclustersofaminorcomponent. Nanophaseseparationhasbeenobservedinvarioussulfideglasses,suchasGa-La-S,Ag-Ge-S,andGe-Sb-S.Theseglassesexhibitabimodaldistributionoftheaveragecoordinationnumber,indicatingthepresenceoftwodistinctphaseswithdifferentdegreesofnetworkpolymerization.Theminorphaseistypicallycomposedofthemetalandchalcogenelements,whilethemajorphaseismainlycomposedofS-Sbonds.Thesizeandvolumefractionoftheminorphasedependonthecompositionandpreparationconditions. Theformationofnanoscaleclustershasbeenobservedinvarioussulfideglasses,suchasAs-S,As-Se,andGe-S