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Synthesis of nanocrystalline Bi2Te3 via mechanical alloying |
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| Authors: | M. Zakeri M. Allahkarami Gh. Kavei A. Khanmohammadian M.R. Rahimipour |
| Affiliation: | 1. National Isotope Centre, GNS Science, PO Box 31312, Lower Hutt 5010, New Zealand;2. The MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand;3. Department of Physics and Nanotechnology, SRM University, Kattankulathur, Chennai 603203, India;4. Robinson Research Institute, Victoria University of Wellington, PO Box 33436, Lower Hutt 5046, New Zealand;5. University of Melbourne, Bio21 Institute, Melbourne, Victoria 3010, Australia;6. Materials Science & Engineering Department, Rensselaer Polytechnic Institute, Troy, NY 12180, USA |
| Abstract: | Bi40Te60 thermoelectric compound was fabricated via mechanical milling of bismuth and tellurium as starting materials. Effect of the milling time and heat treatment temperatures were investigated. In order to characterize the ball milled powders, the X-ray diffraction (XRD) was used. Thermal behavior of the mechanically alloyed powders was studied by differential thermal analysis (DTA). The morphological evolutions were studied by scanning electron microscopy (SEM). Results showed that the nanocrystalline Bi2Te3 compound was formed after 5 h of milling. Further milling (25 h) and heating to 500 °C showed that the synthesized phase was stable during these conditions. Nanocrystalline Bi2Te3 with 9–10 nm mean grain size and flaky morphology (lamellar structure) was obtained at the end of milling. |
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