Double filling in skutterudites: A promising path to improved thermoelectric properties

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• 作者：E. Alleno ; D. Bé ; rardan ; C. Godart ; M. Puyet ; B. Lenoir ; R. Lackner ; E. Bauer ; L. Girard and D. Ravot
• 关键词：Skutterudites ; Seebeck coefficient ; Electrical resistivity ; Thermal conductivity ; Thermoelectricity
• 刊名：Physica B
• 出版年：2006
• 出版时间：15 August 2006
• 年：2006
• 卷：383
• 期：1
• 页码：103-106
• 全文大小：209 K

文摘

We have investigated the thermoelectric properties of the Ceb>0.9−b>b>yb>Ybb>yb>Feb>4b>Sbb>12b> series as well as those of a few compounds in the series Ceb>yb>b>/2b>Ybb>yb>b>/2b>Feb>4−b>b>xb>Cob>xb>Sbb>12b>. In the former series, increasing the Yb fraction decreases the resistivity and the Seebeck coefficient. These effects are related to the fact that Yb is not trivalent in this series. In Ceb>0.40b>Ybb>0.53b>Feb>4b>Sbb>12b>, the phonon part of the thermal conductivity is strongly reduced compared to Ceb>0.85b>Feb>4b>Sbb>12b>, leading to a larger figure of merit. We think that the increase of the mass and bonding fluctuations on the rare-earth site would be the main reason for this reduction. In the latter series, an extrapolated value of black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVH-4JXPS94-B&_mathId=mml1&_user=10&_cdi=5535&_rdoc=43&_handle=V-WA-A-W-ZC-MsSAYZA-UUW-U-AAZCBAYVEC-AAZWYEEWEC-VBCUDUEC-ZC-U&_acct=C000050221&_version=1&_userid=10&md5=45259a9487034271bac15deab0c99768"" title=""Click to view the MathML source"">ZT