We report fabrication of nanostructured Bi2-x Sbx Te3 using hydrothermal method followed by cold-pressing and evacuated-and-encapsulated sintering techniques. To obtain lower resistivity, the reaction temperature in the hydrothermal synthesis is investigated and the effects on the ZT values of Bi2-x Sbx Te3 are reported. Both the x = 1.52 and 1.55 samples hydrothermally synthesized at 160 C show lower resistivity than the x = 1.55 sample hydrothermally synthesized at 140 C. However, the power factor is lower for the samples synthesized at 160 C due to the accompanying smaller thermopower. All three samples exhibit remarkably low thermal conductivity of around 0.41 W m-1 K -1 at room temperature. The peak ZT value occurs at 270 K for all three samples, being ZT = 1.75, 1.29 and 1.17 for x = 1.55 (synthesized at 140 C), 1.55 (synthesized at 160 C) and 1.52 (synthesized at 160 C), respectively.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Materials Chemistry