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2004•IEEJ Transactions on Fundamentals and MaterialsOpen access

Thermoelectric Properties of Ce Based Filled Skutterudite Phosphides

Ram Giri, Chihiro Sekine, Ichimin Shirotani, I. Inagawa, Atsushi Yamamoto, Chul‐Ho Lee, Takehiko Yagi

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Abstract

Polycrystalline samples of filled skutterudite phosphide LaxCe1-xRu4P12(0 ≤ x ≤ 0.3) and LaxCe1-xOs4P12(0 ≤ x ≤ 0.5) were synthesized using high temperature and high-pressure techniques. The samples were characterized by x-ray diffractometry. The thermoelectric properties were measured. These properties include electrical resistivity, the Seebeck coefficient and thermal conductivity. La doping Ce based filled skutterudite phosphides enhanced the high power factor value of 0.7×10-3[W/K2m] due to a considerable decrease in the value of resistivity and thermal conductivity without much decrease in the Seebeck coefficient. It has been noticed that doping of more than one rare earth element caused a decrease in the thermal conductivity by increasing randomness and rattling effects.

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Polycrystalline samples of filled skutterudite phosphide LaxCe1-xRu4P12(0 ≤ x ≤ 0.3) and LaxCe1-xOs4P12(0 ≤ x ≤ 0.5) were synthesized using high temperature and high-pressure techniques. The samples were characterized by x-ray diffractometry. The thermoelectric properties were measured. These properties include electrical resistivity, the Seebeck coefficient and thermal conductivity. La doping Ce based filled skutterudite phosphides enhanced the high power factor value of 0.7×10-3[W/K2m] due to a considerable decrease in the value of resistivity and thermal conductivity without much decrease in the Seebeck coefficient. It has been noticed that doping of more than one rare earth element caused a decrease in the thermal conductivity by increasing randomness and rattling effects.

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Available abstract

Polycrystalline samples of filled skutterudite phosphide LaxCe1-xRu4P12(0 ≤ x ≤ 0.3) and LaxCe1-xOs4P12(0 ≤ x ≤ 0.5) were synthesized using high temperature and high-pressure techniques. The samples were characterized by x-ray diffractometry. The thermoelectric properties were measured. These properties include electrical resistivity, the Seebeck coefficient and thermal conductivity. La doping Ce based filled skutterudite phosphides enhanced the high power factor value of 0.7×10-3[W/K2m] due to a considerable decrease in the value of resistivity and thermal conductivity without much decrease in the Seebeck coefficient. It has been noticed that doping of more than one rare earth element caused a decrease in the thermal conductivity by increasing randomness and rattling effects.

Key concepts: Skutterudite, Seebeck coefficient, Thermoelectric effect, Materials science, Electrical resistivity and conductivity, Thermoelectric materials, Thermal conductivity, Doping

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