The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present the use of swept wavelength interferometry for distributed fiber-optic temperature measurements in a nuclear reactor. The sensors consisted of 2-m segments of commercially available, single mode optical fibers. The interrogation technique is based on measuring the spectral shift of the intrinsic Rayleigh backscatter signal along the optical fiber and converting the spectral shift to temperature.
ldquoDevelopment for advanced thermoelectric conversion systemsrdquo supported by the new energy and industrial technology development organization (NEDO) has been successfully completed as one of the Japanese national energy conservation projects. Three types of the cascaded thermoelectric modules operating up to 850 K in high electrode temperature and two types of Bi-Te thermoelectric modules operating...
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...
Deformation of Bi2Te3-based materials was performed. The source disks with nominal compositions of (Bi0.25Sb0.75)2Te3, (Bi0.25Sb0.75)2(Te0.95Se0.05)3 and (Bi0.90Sb0.10)2(Te0.95Se0.05)3 were cut from the ingots grown by the vertical Bridgman method (VBM). The disks were deformed by either cold press (CP) or pressure current heating (PCH). The crystal structures of the deformed materials were identified...
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...
We report thermoelectric characterization of Bi2-xSbxTe3 (x = 0.5, 1.0, and 1.5) synthesized by a solvothermal method using DMF as solvent. For Bi2Te3, the size of the edge and thickness of the hexagonal nanoplatelets are 200-250 nm and 20-25 nm, respectively. Bi2Te3 nanosheets appear to grow epitaxially from the surface of the Te tubes, which forms in the first step and acts as the template for the...
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...
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...
Nanostructuring is one of the effective approaches to lower the thermal conductivity of materials. Nanostructured skutterudite-related compounds CoSb3, Fe0.5Ni0.5Sb3, Fe0.25Ni0.25Co0.5Sb3 and Te-doped CoSb3 were synthesized by a solvothermal route. The bulk materials were prepared by hot pressing or spark plasma sintering from the solvothermally synthesized nanopowders. The thermal conductivity values...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.