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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Area of Science:

  • Materials Science
  • Solid State Physics
  • Energy Conversion

Background:

  • Thermoelectric materials convert heat to electricity, enabling power generation and solid-state refrigeration.
  • Improving thermoelectric performance is hindered by the complex interplay between electrical and thermal transport properties.
  • Optimizing thermoelectric materials requires innovative fabrication techniques to overcome inherent material limitations.

Purpose of the Study:

  • To introduce a novel super-gravity-field re-melting fabrication technology.
  • To synergistically optimize the thermoelectric performance of (Bi,Sb)2Te3 alloys.
  • To demonstrate a new strategy for enhancing thermoelectric materials applicable to other systems.

Main Methods:

  • Utilizing a super-gravity field during the re-melting process of (Bi,Sb)2Te3 alloy.
  • Inducing unusual plastic deformation and microstructure defects via super-gravity.
  • Analyzing microstructure reconstruction and carrier concentration optimization.

Main Results:

  • Achieved ultra-low lattice thermal conductivity (<0.25 W/m K).
  • Obtained a record-high figure of merit (>1.91) for BiSbTe alloy.
  • Demonstrated a thermoelectric module with 6.4% conversion efficiency and 0.34 W/cm2 output power density at 185 K temperature difference.

Conclusions:

  • The super-gravity fabrication method significantly enhances thermoelectric properties by optimizing microstructure and carrier concentration.
  • This novel approach offers a promising strategy for advancing thermoelectric materials for efficient energy conversion.
  • The demonstrated technology has potential applications in various thermoelectric materials and devices.