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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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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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Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Extremely low lattice thermal conductivity in light-element solid materials.

Ni Ma1, Lu Liu2, Runhua Wu1

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.

National Science Review
|January 7, 2025
PubMed
Summary

Researchers developed new light-element crystalline materials with low lattice thermal conductivity (κl). These materials, featuring hierarchical structures, offer a stable and non-toxic alternative to heavy-element compounds for energy applications.

Keywords:
light-element materialslow lattice thermal conductivitysquare-net lattice

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Thermal Transport

Background:

  • Lattice thermal conductivity (κl) is crucial for energy conversion, but low-κl materials often use heavy elements, posing stability and toxicity issues.
  • Exploring light-element alternatives is essential for developing safer and more sustainable materials.

Purpose of the Study:

  • To investigate light-element crystalline materials with hierarchical structures for achieving low lattice thermal conductivity.
  • To understand the fundamental mechanisms behind low thermal transport in these novel materials.

Main Methods:

  • Computational and experimental analysis of materials with simple square-net lattices and hierarchical structures.
  • Investigation of phonon behavior, including phonon branch flattening and phonon-phonon interactions.
  • Characterization of phonon anharmonicity and its correlation with thermal conductivity.

Main Results:

  • Light-element materials with hierarchical structures and small atomic mass/radius discrepancies exhibit low lattice thermal conductivity.
  • Hierarchical structures lead to varied chemical bonds and asymmetric units, resulting in flat phonon branches and strong phonon-phonon interactions.
  • KCu4Se3 demonstrated an exceptionally low κl of 0.12 W/(m·K) at 573 K, outperforming many heavy-element materials.

Conclusions:

  • Hierarchical structures and phonon anharmonicity are key to achieving extremely low lattice thermal conductivity in light-element materials.
  • These findings challenge conventional understanding and pave the way for designing novel, efficient, and safe low-κl solids.
  • The study advances the field of thermal transport and material design for energy applications.