Physical properties of novel thermoelectric skutterudites:: EuyFe4-xCoxSb12 and EuyFe4-xNixSb12

被引：8

作者：

Berger, S ^{[1
]}

Paul, C ^{[1
]}

Bauer, E ^{[1
]}

Grytsiv, A ^{[1
]}

Rogl, P ^{[1
]}

Kaczorowski, D ^{[1
]}

Saccone, A ^{[1
]}

Ferro, R ^{[1
]}

Godart, C ^{[1
]}

机构：

[1] Vienna Tech Univ, Inst Expt Phys, A-1040 Vienna, Austria

来源：

TWENTIETH INTERNATIONAL CONFERENCE ON THERMOELECTRICS, PROCEEDINGS | 2001年

关键词：

D O I：

10.1109/ICT.2001.979826

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Alloys from the two solid solutions EuyFe4-xCoxSb12 and EuyFe4-xNixSb12 were synthesised by argon arc-melting and isotypism was established with the skutterudite-type structure LaFe4P12. The Eu-content of the samples was determined by Rietveld refinements and electron microprobe measurements EMPA confirming a gradual decrease of the maximum Eu-content from y = 0.83 in EuyFC4Sb12 to y = 0.44 in EuyCo4Sb12 and to y=0.56 in EuyFe2Ni2Sb12. Eu0.83Fe4Sb12 orders magnetically around 84 K and the transition temperature decreases as a function of the Fe/Co and Fe/Ni substitution. X-ray absorption edge and magnetic susceptibility measurements served to define the electronic configuration of Eu and the magnetic state of the polyanions [Fe4-xCoxSb12]. To evaluate the figure of merit, thermopower, thermal conductivity and electrical resistivity measurements were per-formed. Due to the Fe/Co-substitution the hole number is reduced and further compensated by the electropositive element. This influences the Seebeck coefficients significantly, which has a great impact on the figure of merit.

引用

页码：77 / 80

页数：4

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