Year: 2005
Type: article
Abstract: Plastic deformation study of Bi2Te3-related materials was performed. The ingots were grown by the Bridgman method using the following source materials with the nominal compositions of Bi0.5Sb1.5Te3, Bi2Te2.85Se0.15 and Bi1.8Sb0.2Te2.85Se0.15. Disks were cut from the ingots, and then they were deformed by cold and hot-pressing under pulse-current heating. The crystal structures of the deformed samples were identified by X-ray diffraction. All diffraction peaks were assigned to Bi2Te3 structure and the diffraction patterns indicate that the surface and bottom of the samples were highly oriented in the hexagonal (00•l) plane. The Hall effect measurements show that carrier concentration of the samples is in the order of magnitude of 1025 m-3 at room temperature. The power factor for the samples after the hot-press deformation exceeded those for the original ingots. The results indicate that the hot press deformation can be expected to enhance thermoelectric properties of Bi2Te3-related materials.
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2064628214