Polycrystalline samples of Sm partially filled skutterudites SmyFexCo4-xSb12 were prepared by melting and Spark Plasma Sintering technique. The results of Rietveld refinement showed that the obtained SmyFexCo4-xSb12 s...Polycrystalline samples of Sm partially filled skutterudites SmyFexCo4-xSb12 were prepared by melting and Spark Plasma Sintering technique. The results of Rietveld refinement showed that the obtained SmyFexCo4-xSb12 samples possessed filled skutterudite structures. The thermal parameter （B） of Sm is larger than that of Sb, Fe, and Co, indicating that Sm ＂rattled＂ in Sb-icosahedron voids. The effects of filling atom Sm on thermoelectric properties of these compounds were investigated. With the increase of Sm filling fraction （y）, electrical conductivity decreased, Seebeck coefficient increased and had a maximum value when y was 0.38; thermal conductivity reduced and had a minimum value when y was 0. 32. At 750 K, the highest figure of merit of 0.68 was obtained for Sm0.32Fe1.47Co2.53Sb12.展开更多
Effects of Ba filling fraction on the thermoelectric properties of p type filled skutterudite compounds Ba yFe 1.6 Co 2.4 Sb 12 (y=0-0.63) were investigated.Ba yFe 1.6 Co 2.4 Sb 12 showed p...Effects of Ba filling fraction on the thermoelectric properties of p type filled skutterudite compounds Ba yFe 1.6 Co 2.4 Sb 12 (y=0-0.63) were investigated.Ba yFe 1.6 Co 2.4 Sb 12 showed p type conduction.The hall coefficient (R H) and seebeck coefficient(α) increased with increasing Ba filling fraction.But hole concentration (p) and electrical conductivity (σ) decreased.While Ba filling fraction was about 0.4,the lattice thermal conductivity (κ L) reached the minimum value.The results show that effect of Ba rattling on phonon scattering is the strongest as Sb icosahedron partial voids are filled by Ba.A maximum dimensionless thermoelectric figure of merit (ZT) value of 0.7 was obtained for Ba 0.38 Fe 1.6 Co 2.4 Sb 12 at 750K.展开更多
基金Project supported by the National Natural Science Foundation of China (50372049)the Major International Cooperation Program of the National Natural Science Foundation of China (50310353)
文摘Polycrystalline samples of Sm partially filled skutterudites SmyFexCo4-xSb12 were prepared by melting and Spark Plasma Sintering technique. The results of Rietveld refinement showed that the obtained SmyFexCo4-xSb12 samples possessed filled skutterudite structures. The thermal parameter （B） of Sm is larger than that of Sb, Fe, and Co, indicating that Sm ＂rattled＂ in Sb-icosahedron voids. The effects of filling atom Sm on thermoelectric properties of these compounds were investigated. With the increase of Sm filling fraction （y）, electrical conductivity decreased, Seebeck coefficient increased and had a maximum value when y was 0.38; thermal conductivity reduced and had a minimum value when y was 0. 32. At 750 K, the highest figure of merit of 0.68 was obtained for Sm0.32Fe1.47Co2.53Sb12.
基金ThisworkwaspartiallysupportedbyaGrant in AidforEncouragementofYoungScientists (A) (No .12 75 0 5 91) Japan .ThisworkwasalsosupportedpartiallybytheResearchFoundationforMaterialsScience apan
文摘Effects of Ba filling fraction on the thermoelectric properties of p type filled skutterudite compounds Ba yFe 1.6 Co 2.4 Sb 12 (y=0-0.63) were investigated.Ba yFe 1.6 Co 2.4 Sb 12 showed p type conduction.The hall coefficient (R H) and seebeck coefficient(α) increased with increasing Ba filling fraction.But hole concentration (p) and electrical conductivity (σ) decreased.While Ba filling fraction was about 0.4,the lattice thermal conductivity (κ L) reached the minimum value.The results show that effect of Ba rattling on phonon scattering is the strongest as Sb icosahedron partial voids are filled by Ba.A maximum dimensionless thermoelectric figure of merit (ZT) value of 0.7 was obtained for Ba 0.38 Fe 1.6 Co 2.4 Sb 12 at 750K.
