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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
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Author Spotlight: Advancing Energy Solutions Using Nanocomposites as Processed Thermoelectric Materials
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Reduced Thermal Conductivity of Mg2(Si, Sn) Solid Solutions by a Gradient Composition Layered Microstructure.

Zhifang Zhou1,2, Yaw Wang Chai1, Yu Ikuta3

  • 1Department of Materials Science and Engineering, Tokyo Institute of Technology, 4259-J3-19, Nagatsuta, Midori-ku, Yokohama 226-8502, Japan.

ACS Applied Materials & Interfaces
|April 4, 2020
PubMed
Summary

A novel layered structure in magnesium silicide-tin (Mg₂(Si,Sn)) solid solutions significantly reduces thermal conductivity. This discovery enhances thermoelectric performance by creating more phonon-scattering interfaces.

Keywords:
Mg2(Si, Sn) solid solutionsgradient composition layered structurephonon scatteringsemi-coherent interfacial structurethermal conductivitythermoelectric materials

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Area of Science:

  • Materials Science
  • Solid-state Chemistry
  • Thermoelectrics

Background:

  • Mg₂(Si,Sn) solid solutions are key for thermoelectric applications.
  • Reducing thermal conductivity is crucial for improving thermoelectric efficiency.

Purpose of the Study:

  • Investigate the impact of a unique layered structure on Mg₂(Si,Sn) thermal conductivity.
  • Explore the relationship between microstructure and thermoelectric properties.

Main Methods:

  • Nonequilibrium solidification and peritectic reaction processes were employed.
  • Microstructural analysis focused on layered structures and interfacial properties.
  • Thermal conductivity measurements were conducted at elevated temperatures.

Main Results:

  • A layered structure with gradient Sn/Si ratios was observed in Mg₂(Si,Sn).
  • Semi-coherent interfaces with misfit dislocations act as phonon-scattering centers.
  • Undoped Mg₂Si₀.₇₅Sn₀.₂₅ with higher layer density showed lower thermal conductivity (1.9 W m⁻¹ K⁻¹ at 523 K).

Conclusions:

  • The discovered layered structure offers a new pathway to reduce thermal conductivity in Mg₂(Si,Sn).
  • Enhanced phonon scattering at interfaces significantly contributes to lower thermal conductivity.
  • This microstructural engineering approach holds promise for advanced thermoelectric materials.