Google Search

A7: Developments in measurement techniques and preparation methods

Preparation of thermoelectric nanoparticles using ultrasonic milling

L M Garcia1, We Liu1,2, J J Bomphrey1, D J Javis3 and Gao Min1
1. School of Engineering, Cardiff University, Cardiff, CF24 3AA UK2. Hubei University of Automotive Technology, Shiyan City, Hubei, China3. European Space Agency, ESTEC, PO Box 299, 2200 AG Noordwijk, Netherlands

The capability to produce nanoscale thermoelectric powders is of particular interest in developing nanostructured bulk materials. In this paper, we show that nanoscale Bi2Te3 and Mg2Si powders can be obtained using high intensity ultrasonic milling. In addition, significant morphological change on the particles was observed while the compositions and crystal structures remain essentially unchanged. A systematic investigation was carried out to identify the relationship between the milling conditions and resultant morphological changes. In comparison with ball milling, the results of this experiment demonstrate that ultrasonic milling can offer a better solution to reduce the particle size without changing the composition and crystal structure of materials.