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Thermoelectric properties of ternary silver thallium tellurides: Ag8T12Te5 and AgT13Te2 were studied above room temperature to slightly below the melting temperature. As for Ag8T12Te5, the effects of Te content on the thermoelectric properties were also studied by characterizing the samples of Ag8T12Tex (x = 5.0, 5.1, 5.2). Both compounds show positive Seebeck coefficient (S). Ag8T12Te5 indicates...
The polycrystalline samples of BaSi2, SrSi2, and LaSi were prepared by spark plasma sintering (SPS). The electrical resistivity (rho) and Seebeck coefficient (S) were measured above room temperature. The S of BaSi2 was negative and the absolute values were rather high (-669 muVK-1 at 337 K). The S of SrSi2 was positive and the absolute values were lower (118 muVK-1 at 332 K) than those of BaSi2. For...
The SrTiO3 and Y-doped SrTiO3 polycrystalline sintered bodies were synthesized by the polymerized complex (PC) process and the subsequent hot pressing at 1473 K for 1 h or at 1673 K for 2 h in Ar atmosphere. The X-ray diffraction patterns of the SrTiO3 and Sr0.9Y0.1TiO3 samples synthesized by the PC process and hot pressing at 1473 K showed that these samples were mostly composed of the SrTiO3 single...
Cooling is important to keep the temperatures of the highly integrated silicon electronic devices and power devices e.g. power MOSFET, IGBT. Yamaguchi et al. have proposed a new scheme to cool down the devices by its own current named ldquoself-cooling devicerdquo, in which the cooling process uses Peltier effect. In the proposed scheme, we should use the materials that have high thermal conductivity,...
To study the effect of double filling of the skutterudite iron antimonides on the thermal conductivity, we have synthesized dense samples of Ca1-xLaxFe4Sb12 (0 les times les 1) and Ca0.3La0.6Fe4-yCoySb12 (y = 1, 1.5) by the spark plasma sintering technique. Electron-probe microanalysis revealed that the double-filled samples with x = 0.25, 0.5, and 0.75 consist of three phases of micrometer scale;...
In this study, we fabricated in-plane thermoelectric micro-generators (4 mm times 4 mm) based on bismuth telluride thin films by using flash evaporation method. The thermoelectric properties of as-grown thin films are lower than those of bulk materials. Therefore the as-grown thin films were annealed in hydrogen at atmospheric pressure for 1 hour in a temperature range of 200 degC. to 400degC. By...
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