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Based on the rapid sintering characteristic of nanoparticles at a relatively low temperature, a novel bonding process using Ag metallo-organic nanoparticle paste has been proposed. This paste is considered as an alternative for lead-rich high temperature solder. However, further decrease of bonding temperature and pressure is required for industrial application. Additionally, the cost of Ag nanoparticle...
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...
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;...
New interstitial compounds Sm(Fe11Ti)X1-∂ (X=N, ∂=0.8 and X=C, ∂=0.7) were prepared by heating a fine powder of Sm(Fe11Ti) in nitrogen and butane, respectively. The nitride showed a 3% increase in unit cell volume, an approximately 10% increase in iron moment (estimated from 57Fe M??ssbauer spectra) and a 185K increase in the Curie temperature to 769K. The uniaxial anisotropy is destroyed, however,...
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