摘要
Starting with elementary powders, thermoelectric materials Ce_ x Co_4Sb_(12) were prepared by mechanical alloying and spark plasma sintering (MA-SPS). XRD analyses reveal that the expected major phase, named skutterudite was formed in MA process and was kept after SPS. The thermoelectric properties of MA-SPS samples including resistivity, Seebeck coefficient, power factor, thermal conductivity and the dimensionless figure of merit ( ZT ) were studied by varying Ce content and temperature. Depending on Ce levels, both P and N types of thermoelectric semiconductors were obtained. MA-SPS sintered Ce_(1.0)Co_4Sb_(12) exhibits the highest ZT in the range of 100～500 ℃ and the maximum ZT is found at x =1.0 and 400 ℃.
Starting with elementary powders, thermoelectric materials Ce_ x Co_4Sb_(12) were prepared by mechanical alloying and spark plasma sintering (MA-SPS). XRD analyses reveal that the expected major phase, named skutterudite was formed in MA process and was kept after SPS. The thermoelectric properties of MA-SPS samples including resistivity, Seebeck coefficient, power factor, thermal conductivity and the dimensionless figure of merit ( ZT ) were studied by varying Ce content and temperature. Depending on Ce levels, both P and N types of thermoelectric semiconductors were obtained. MA-SPS sintered Ce_(1.0)Co_4Sb_(12) exhibits the highest ZT in the range of 100～500 ℃ and the maximum ZT is found at x =1.0 and 400 ℃.
基金
ProjectsupportedbyNationalNaturalScienceFoundationofChinaundergranted ( 5 0 2 710 0 1)
BeijingMunicipalEducationCommissionundercontract (KZ2 0 0 3 10 0 0 5 0 0 1)
