Cerium filling and doping of cobalt triantimonide
Cerium filling and doping of cobalt triantimonide
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DOI：
10.1103/physrevb.56.7376
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发表时间：
1997-09-15
影响因子：
3.7
通讯作者：
Uher, C
中科院分区：
文献类型：
--
作者：
Morelli, DT;Meisner, GP;Uher, C
我们制备并研究了CeyFe4-xCoxSb12形式的填充Skutterudite的结构、磁性和输运性质。对于含100%Co的样品，Ce可以插入到Skutterudite结构中约10%的空隙中。结果表明，稀土为三价稀土，掺杂主体为CoSb3n型。随着Fe对Co的取代，Ce的空位占有率增加。尽管n型样品的电子迁移率比p型样品的空穴迁移率小，但由于n型材料的电子质量较大，n型材料的塞贝克系数在高电子浓度下仍保持较大值。
We have fabricated and studied the structural, magnetic, and transport properties of filled skutterudites of the form CeyFe4-xCoxSb12 with 0 < y < 1 and x=3.25 and 4. For samples containing 100% Co, Ce can be inserted into approximately 10% of the voids in the skutterudite structure. It is shown that the rare earth is trivalent and dopes the host CoSb3 n-type. With substitution of Fe for Co the void occupancy by Ce increases. The thermal conductivity is strongly depressed even at small (5%) rare-earth filling fractions, and is further degraded by substitution of Fe for Co. Although the electron mobility in n-type samples is smaller than the hole mobility in p-type samples, due to their large electron masses the Seebeck coefficient in n-type material maintains large values at high electron concentrations.