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Related Concept Videos

Members Made of Elastoplastic Material01:19

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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Si-Based Materials for Thermoelectric Applications.

Sora-At Tanusilp1, Ken Kurosaki2,3,4

  • 1Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan. tanusilp-s@ms.see.eng.osaka-u.ac.jp.

Materials (Basel, Switzerland)
|June 20, 2019
PubMed
Summary

Silicon-based materials show promise for thermoelectric applications. Researchers achieved a high figure of merit (zT) in nanostructured silicon and explored novel silicide nanocomposites, including YbSi2, for enhanced thermoelectric performance.

Keywords:
SiYbSi2melt spinningnanocompositenanostructuringthermoelectric

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Silicon-based thermoelectric materials offer advantages like low toxicity, cost-effectiveness, and stability.
  • Developing efficient silicon-based thermoelectrics is crucial for waste heat recovery and solid-state cooling.

Purpose of the Study:

  • To report recent advancements in synthesizing and characterizing silicon-based thermoelectric materials.
  • To investigate nanostructured bulk silicon and silicon-metal silicide nanocomposites for improved thermoelectric properties.

Main Methods:

  • Natural nanostructuring for bulk silicon synthesis.
  • Rapid-solidification melt-spinning (MS) technique for creating silicon-metal silicide nanocomposites (CrSi2, CoSi2, TiSi2, VSi2).
  • Characterization of material structure and thermoelectric properties.

Main Results:

  • Bulk silicon synthesized via natural nanostructuring achieved a thermoelectric figure of merit (zT) of 0.6 at 1050 K.
  • Melt-spinning produced homogeneous dispersion of nanoscale silicide precipitates (CrSi2, CoSi2, TiSi2, VSi2) within a silicon matrix.
  • A novel ytterbium silicide (YbSi2) demonstrated a high power factor at room temperature, indicating significant potential.

Conclusions:

  • Nanostructuring and nanocomposite approaches enhance the thermoelectric performance of silicon-based materials.
  • YbSi2 is a promising new material for room-temperature thermoelectric applications.
  • Further research into silicon-metal silicide nanocomposites could lead to efficient thermoelectric devices.