Influence of P on Microstructure and Thermoelectric Property of Sintered (Bi0.2Sb0.8)2Te3 Alloy
Year: 2002
Type: article
Abstract: A combination of mechanical alloying and pulse discharge sintering (MA-PDS) was employed to synthesize the bulk (Bi0.2Sb0.8)2Te3 alloys with the P addition up to 2.0 mass%. The effect of P on the microstructure and thermoelectric performance of the compacts were investigated. The added P exists in the alloyed powders and compacts in the form of second phase particles. The dispersed P particles were found to decrease the size of (Bi, Sb)2Te3 crystallites and inhibit the densification of the alloyed powders. When the P content ≥1.0 mass%, (Bi0.2Sb0.8)2Te3/P nanocomposites were developed by the MA-PDS process. Inclusion of a small fraction of P (≤0.1 mass%) is harmless to the thermoelectric performance of the p-type (Bi0.2Sb0.8)2Te3 alloy. In the samples with high P contents, in particular, ≥1.0 mass%, however, the increase in the electrical resistivity is much greater than the decrease in the thermal conductivity, finally giving rise to degradation of the room-temperature figure of merit.
Source: MATERIALS TRANSACTIONS
Authors: Liu Xue-Dong, Akihiro Nozue, Yong-Ho Park
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2016545585