Journal
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
Volume 22, Issue 3, Pages 201-206Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2012.04.006
Keywords
Thermoelectric (TE) material; Cryogenic grinding; Bi2Te3; Nanoparticles; Two-step breaking model
Funding
- Shanghai Committee of Science and Technology [10JC1400500]
- Shanghai Municipal Education Commission
- Shanghai Education Development Foundation [11SG34]
- New Century Excellent Talents in University [NCET-10-0323]
- Fundamental Research Funds for the Central Universities
- Shanghai Leading Academic Discipline Project [B603]
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A novel method for rapid preparation of Bi2Te3 nano-sized powders with an average particle size of about 7nm was developed. A starting powder mixture consisting of Bi2Te3 coarse particles of similar to 5mm was ground using cryogenic grinding in the liquid nitrogen. For comparison, the conventional high-energy ball milling was used to prepare the Bi2Te3 nano-sized powders. Sintering properties of as-prepared powders was investigated by spark plasma sintering (SPS). The effects of the preparation procedure on the crystallinity, morphology and structure were examined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that Bi2Te3 was not transformed into a non-equilibrium amorphous phase or decomposed during the cryogenic grinding process, and as-prepared nano-powders possessed excellent sinterability. This technique might also be applicable to other thermoelectric materials.
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