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Tatsuoka, Hirokazu; Takagi, Noriyuki; Inaba, Takashi; Ohishi, Takuya; Mizuyoshi, Yusuke; Miura, Kentaro; Yamada, R.

doi:10.2320/materia.44.466

Cited by 2 publications

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“…Among them, Ca5Si3 and Ca2Si have been reported to show semiconducting behavior [8,9]. It has been estimated by pseudopotential calculations that Ca2Si has the energy gap of 0.36 eV [l0].…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of calcium silicides

Imamura

Muta

Kurosaki

et al. 2006

2006 25th International Conference on Thermoelectrics

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We investigated the thermoelectric properties of CaSi, Ca5Si3 and Ca2Si. Polycrystalline CaSi and Ca5Si3 were prepared by spark plasma sintering (SPS) technique. Polycrystalline Ca2Si was prepared by an interdiffusion process. The electrical resistivity, Seebeck coefficient, and thermal conductivity for CaSi and Ca5Si3 were measured from room temperature to approximately 1000 K. Then, the figure of merit was evaluated by using these values. The temperature dependence of the electrical properties for CaSi and Ca5Si3 showed metallic behavior in all temperature range. CaSi showed n-type conduction and Ca5Si3 showed p-type conduction. The evaluated maximum dimensionless figure of merit for CaSi and Ca5Si3 are 5.1 X 10-3 at 950 K and 0.11 at 950 K, respectively. IntroductionThermoelectric power generation can directly convert heat into electricity by giving temperature differences to both ends of thermoelectric materials. The efficiency of thermoelectric conversion increases with the dimensionless figure of merit, ZT = S2cT/K, where Z, T, S, CT, and K are the figure of merit, absolute temperature, Seebeck coefficient, electrical conductivity, and thermal conductivity, respectively. A large variety of materials, such as intermetallic compounds, silicides, and borides have been investigated as thermoelectric materials. Particularly, several metal silicides, such as Mg2(Si,

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“…Among them, Ca5Si3 and Ca2Si have been reported to show semiconducting behavior [8,9]. It has been estimated by pseudopotential calculations that Ca2Si has the energy gap of 0.36 eV [l0].…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of calcium silicides

Imamura

Muta

Kurosaki

et al. 2006

2006 25th International Conference on Thermoelectrics

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Thermoelectric Properties of Ca-Mg-Si Alloys

et al. 2009

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To improve thermoelectric performance of p-type, Ca-Mg-Si alloys were synthesized by mechanical alloying (MA) and/or solid-liquid reaction (SLR phase, and its was metallic trend ( ' 0) with low electrical resistivity . It is well-known that Mg 2 Si is n-type semiconductor. These results indicate that the CaMgSi is p-type. Its was estimated at 750$900 mVÁK À1 (p-type) at 600 K and its was lower than that of Mg 2 Si above 600 K. The P of CaMgSi single phase is expected more than 1:4 Â 10 À3 WÁm À1 ÁK À2 (600 K). Thus, CaMgSi is attractive material with high thermoelectric performance of p-type.

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Cited by 2 publications

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Thermoelectric properties of calcium silicides

Thermoelectric properties of calcium silicides

Thermoelectric Properties of Ca-Mg-Si Alloys

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