Articles written in Bulletin of Materials Science
Volume 34 Issue 6 October 2011 pp 1209-1212
Thermoelectric material, Ag1−𝑥Pb𝑚SbTe𝑚+2 (𝑥 = 0.2, 𝑚 = 10), have been successfully prepared by high pressure method. The pressure-dependent electrical transport and thermoelectric properties of Ag0.8Pb10SbTe12 were studied at room temperature. Electrical resistivity and Seebeck coefficient decreases with an increase of synthetic pressure. Thermal conductivities are nearly constant when the pressure is lower than 4 GPa. The carrier concentrations of Ag0.8Pb10SbTe12 were tuned by more than a factor of 100 through changing of synthetic pressure. These results indicate that high pressure technique provides a viable and controllable way of tuning the electrical transport properties for AgPb𝑚SbTe𝑚+2.
Volume 37 Issue 5 August 2014 pp 963-967
Thermoelectric ceramics, Ag𝑥Y𝑦Ca2.8Co4O9 + 𝛿 (0 ≤ 𝑥, 𝑦 ≤ 0.15), have been prepared using a sol–gel method, followed by pressureless sintering. The phase structures and microstructures of oxides were investigated at room temperature. Thermoelectric properties including Seebeck coefficient, electrical conductivity and thermal conductivity were measured from 303 to 973 K. It was found that the samples contain nanostructured Ag phase with grain size of 100 nm. The Ag0.05Y0.15Ca2.8Co4O9 + 𝛿 sample has the maximum figure of merit (ZT ∼ 0.14 @ 973 K), which is about 27% higher than that of Ca3Co4O9 + 𝛿.
Volume 42 | Issue 6
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