Work

Fabrication and Enhanced Thermoelectric Properties of Alumina Nanoparticle‐Dispersed Bi0.5Sb1.5Te3 Matrix Composites

Year: 2013

Type: article

Abstract: Alumina nanoparticle‐dispersed bismuth‐antimony‐tellurium matrix (Al2O3/BST) composite powders were fabricated by using ball milling process of alumina nanoparticle about 10 nm and p‐type bismuth telluride nanopowders prepared from the mechanochemical process (MCP). The fabricated Al2O3/BST composite powders were a few hundreds of nanometer in size, with a clear Bi0.5Sb1.5Te3 phase. The composite powders were consolidated into p‐type bulk composite by spark plasma sintering process. High‐resolution TEM images reveal that alumina nanoparticles were dispersed among the grain boundary or in the matrix grain. The sintered 0.3 vol.% Al2O3/BST composite exhibited significantly improved power factor and reduced thermal conductivity in the temperature ranging from 293 to 473 K compared to those of pure BST. From these results, the highly increased ZT value of 1.5 was obtained from 0.3 vol.% Al2O3/BST composite at 323 K.

Source: Journal of Nanomaterials

DOI: 10.1155/2013/821657

Authors: Kyung Tae Kim, Gook Hyun Ha

Institution: Korea Institute of Materials Science

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $2,375