Fabrication of Mg₂Si Thermoelectric Materials by Mechanical Alloying and Spark-Plasma Sintering Process

Authors: Lee, Chung-Hyo; Lee, Seong-Hee; Chun, Sung-Yong; Lee, Sang-Jin

Source: Journal of Nanoscience and Nanotechnology, Volume 6, Number 11, November 2006 , pp. 3429-3432(4)

Publisher: American Scientific Publishers

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Abstract:

A mixture of pure Mg and Si powders with an atomic ratio 2:1 has been subjected to mechanical alloying (MA) at room temperature to prepare the Mg₂Si thermoelectric material. Mg₂Si intermetallic compound with a grain size of 50 nm can be obtained by MA of Mg_66.7Si_33.3 powders for 60 hours and subsequently annealed at 620 °C. Consolidation of the MA powders was performed in a spark plasma sintering (SPS) machine using graphite dies up to 800-900 °C under 50 MPa. The shrinkage of consolidated samples during SPS was significant at about 250 °C and 620 °C. X-ray diffraction data shows that the SPS compact from 60 h MA powders consolidated up to 800 °C consists of only nanocrystalline Mg₂Si compound with a grain size of 100 nm.

Keywords: MECHANICAL ALLOYING; SPARK PLASMA SINTERING; NANOCRYSTALLINE MG2SI COMPOUND; X-RAY DIFFRACTION; DIFFERENTIAL SCANNING CALORIMETRY

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2006.027

Publication date: 2006-11-01

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Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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