p型bi2te3基复合热电材料的制备及其性能分析

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1、东华大学硕士学位论文摘要307%。通过引入不同粒径的CuAlO2，利用纳米颗粒和微米颗粒化学稳定性的差异，实现了复合材料的热导率、电导率和Seebeck系数的协同调控，为低成本调控热电材料性能探索了一条新途径。关键词：热电材料，Bi0.5Sb1.5Te3，CuAlO2，热电性能IV万方数据东华大学硕士学位论文AbstractTHEPREPARATIONANDTHERMOELECTRICPROPERTIESOFP-TYPEBi2Te3-BASEDCOMPOSITETHERMOELECTRICMAT

2、ERIALSABSTRACTBi2Te3-basedalloysarethestate-of-the-artthermoelectricmaterialswithaZT(figureofmerit)ofabout1atroomtemperature.Amongthem,Bi2-xSbxTe3isthebestoptimizedP-typeBi2Te3-basedalloy.AlthoughBi2Te3-basedthermoelectricmaterialshaveachievedsomepro

3、gressinpowergenerationandsemiconductorcooling,ithasnotrealizedthelargescaleapplicationsyetduetothehighcostofrawmaterials,timeconsumptionandnothighenoughthermoelectrictransferefficiency.Hence,howtorealizethepreparationofhigh-performancethermoelecteicm

4、aterialsthroughthelowcostmethodwillhaveprofoundmeaningsforpromotingthethermoelectricmaterialsanditsdevicesapplications.Thethreeparameters:Seebeckcoefficient(α),electricalconductivity(σ)andthermalconductivity(κ)thatdeterminethefinalZTvaluesarestrongly

5、coupledviabandstructuresandscatteringmechanisms.Therefore,howtooptimizethreeparamaterssynchronouslyisthebigissueforthermoelectricmaterials.Thekeytodevelopthehigh-performancethermoelectricmaterialsistoimproveboththeelectricalconductivityandSeebeckcoef

6、ficientwhiledecreasingthethermalconductivity.Inthispaper,wefirstprepareBi2-xSbxTe3powdersbylowcosthydrothermalmethod,thenthesecondphaseisintroducedtorealizetheimprovementinZTvaluebyenhancingboththeelectricalconductivityandSeebeckcoefficient,atthemean

7、time,reducingornotlargelyaffectingthethermalconductivity.Inthisstudy,weintroduceMWCNT,AgNWsandCuAlO2torealizethesynchronouslyoptimizationofthesethressparameterstoenhancethefinalZTvalues.Inthispaper,V万方数据东华大学硕士学位论文Abstracthydrothermalmethodcombinedwit

8、hSparkPlasmaSinteringisusedtopreparetheBi0.4Sb1.6Te3matrix.Multi-scaleCuAlO2powdersispreparedbysolidreactionsinteringmethod.MWCNT、AgNWsandCuAlO2areseparatelyintroducedintoBi0.4Sb1.6Te3nanopowderstoformthecompositepowders.Thenthesecompositepowderswere