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Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
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Leveraging Polymorphism in YbCuBi to Map Transport and Elastic Properties.

A K M Ashiquzzaman Shawon1,2, George Yumnam2, Hsin Wang2

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Structural changes in YbCuBi Zintl compounds directly impact their thermal properties. Corrugation of the honeycomb lattice influences elastic and thermal transport, offering insights for designing new functional materials.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • AMX Zintl compounds exhibit unique properties due to their honeycomb sublattice.
  • Vacancy tolerance and low thermal conductivity are key features of these materials.

Purpose of the Study:

  • Investigate the structure-property relationship in AMX Zintl compounds using YbCuBi as a model.
  • Elucidate the effect of temperature-dependent polymorphism on elastic and thermal transport properties.

Main Methods:

  • Inelastic neutron scattering and resonant ultrasound spectroscopy were employed.
  • First-principles calculations and thermal conductivity measurements complemented experimental data.

Main Results:

  • YbCuBi exhibits a structural transition below 410 K, altering its layer structure from flat to corrugated.
  • A direct correlation was found between honeycomb lattice corrugation and changes in elastic and thermal transport properties.

Conclusions:

  • The crystallographic transition in YbCuBi significantly affects its physical properties.
  • Understanding lattice corrugation is crucial for designing Zintl phases with tailored thermal conductivity.