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Related Concept Videos

Generator Voltage Control01:21

Generator Voltage Control

Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
Turbine-Governor Control01:17

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Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...
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Power System Distribution01:25

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Power system distribution involves delivering electrical energy from power plants to consumers through a network of transmission and distribution systems. The process begins at power plants, where energy from coal, gas, nuclear, water, and wind is converted into electrical energy. These plants use three-phase generators, typically rated between 50 to 1300 MVA, with terminal voltages ranging from a few kV to 20 kV, depending on the size and age of the units.
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High-Performance Thermoelectric Bulk Colusite by Process Controlled Structural Disordering.

Cédric Bourgès1, Yohan Bouyrie2, Andrew R Supka3

  • 1Laboratoire CRISMAT, UMR 6508, CNRS, ENSICAEN , 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France.

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|January 16, 2018
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Summary

High-performance thermoelectric bulk sulfides with the colusite structure exhibit low thermal conductivity. Controlling defects enhances thermoelectric properties, achieving near-unity figures of merit in Cu26V2Sn6S32 colusites.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Inorganic Chemistry

Background:

  • Thermoelectric materials convert heat to electricity, crucial for energy harvesting.
  • Colusite sulfides (Cu26V2Sn6S32) show potential but require optimization for efficiency.
  • Achieving high thermoelectric performance necessitates simultaneously optimizing electrical and thermal transport properties.

Purpose of the Study:

  • To engineer high-performance thermoelectric bulk sulfides with the colusite structure.
  • To elucidate the mechanism behind intrinsically low thermal conductivity in colusites.
  • To demonstrate a scalable method for enhancing thermoelectric properties through defect engineering.

Main Methods:

  • Controlled densification processes to introduce structural defects.
  • Point defect and disordered region engineering for phonon scattering.
  • Experimental characterization combined with band structure and phonon calculations.
  • Analysis of sulfur vacancies and antisite defects' impact on carrier concentration.

Main Results:

  • Achieved high-performance thermoelectric bulk sulfides with the colusite structure.
  • Demonstrated enhanced phonon scattering via point defects and disordered regions.
  • Elucidated the intrinsic low thermal conductivity mechanism in colusite samples.
  • Identified the effect of S vacancies and antisite defects on carrier concentration.
  • Engineered high power factors and figures of merit near unity.

Conclusions:

  • Controlling the densification process and structural defects is key to high-performance thermoelectric colusites.
  • Point defects and disordered regions effectively enhance phonon scattering, reducing thermal conductivity.
  • The developed method offers a controlled and scalable route to optimize complex bulk sulfides for thermoelectric applications.