PreparationofpolycrystallinebulkMg2SibyusingNaSi

TakahiroYamada; YusukeOish; HaruhikoMorito; HisanoriYamane

摘要

Recently,thermoelectricmaterialshavebeenattractingattentioninthefieldofeffectiveenergysavingbyutili-zationofwasteheat.Mg2SiandMg2Si-basedmaterialsareexpectedtobeusedasanalternativetoPbTeforapplica-tioninthermoelectricdevicesinthetemperaturerangefrom500to800Kbecauseoftheirhighthermoelectricproperties.Moreover,Mg2Sihasthelowestdensity,i.e.,2.0g/cm3,amongthermoelectricmaterialsanditsconstit-uentelements,i.e.,MgandSi,areabundantandnontoxic[1–4].AccordingtotheMg–SiphasediagrampresentedbyOkamotoetal.[5],Mg2Siistheonlybinaryphaseofthissystemandmeltsat1354K.BecausethemeltingpointofMg2SiisclosetotheboilingpointofMg(1363K)andthevaporizationofMgfromtheMg–Simeltissignificantaroundthistemperature,preparationofMg2Sipolycrys-tallinebulkandsinglecrystalsfromtheMg–Simelthasbeenperformedunder0.2–0.4MPaofinertgastosuppressMgvaporization[6–10].High-pressureprocessingtech-niquessuchassparkplasmasintering(SPS)andhot-pressing(HP)havealsobeenutilizedtoformaMg2SipolycrystallinebulkbelowthemeltingpointofMg2Si.ThestartingmaterialsforthebulkfabricationwereamixtureofMgandSipowdersandMg2Sipowderpreparedbymechanicalalloying[11–15].

机译：最近，thermoelectricmaterialshavebeenattractingattentioninthefieldofeffectiveenergysavingbyutili-zationofwasteheat.Mg2SiandMg2Si-basedmaterialsareexpectedtobeusedasanalternativetoPbTeforapplica-tioninthermoelectricdevicesinthetemperaturerangefrom500to800Kbecauseoftheirhighthermoelectricproperties.Moreover，Mg2Sihasthelowestdensity，即2.0克/立方厘米，amongthermoelectricmaterialsanditsconstit-uentelements，即MgandSi，areabundantandnontoxic [1-4] .AccordingtotheMg-SiphasediagrampresentedbyOkamotoetal。[5]，Mg2Siistheonlybinaryphaseofthissystemandmeltsat1354K.BecausethemeltingpointofMg2SiisclosetotheboilingpointofMg（在此温度下，聚甲基丙烯酸甲酯（1363K）和Mg-Simel的Mg蒸发在此温度下相当重要，因此Mg-Simeltha制备的Mg2Si多晶金属和Mg-Simelthas的单晶在惰性气体中以0.2-0.4MPa的压制抑制了Mg的结晶[6-10]。通过机械合金化制备用于批量制造的起始材料时，需要将Mg和Sipowders与Mg2的混合物混合在一起[11-15]。

PreparationofpolycrystallinebulkMg2SibyusingNaSi

摘要

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