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Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a...
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High-Temperature Atomic Diffusion and Specific Heat in Quasicrystals.

Yuki Nagai1,2,3, Yutaka Iwasaki4,5, Koichi Kitahara6

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Quasicrystals exhibit unusual heat capacity due to phason activity. Hyperatomic fluctuations in aluminum atoms within Al-Pd-Ru quasicrystals explain this high-temperature anomaly.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Crystallography

Background:

  • Quasicrystals possess ordered, nonperiodic structures with unique physical properties.
  • Anomalous high-temperature heat capacity in quasicrystals suggests hidden high dimensionality.
  • Phasons, related to atomic rearrangements in quasicrystals, are a proposed cause for this anomaly.

Purpose of the Study:

  • Investigate the origin of anomalous heat capacity in quasicrystals.
  • Connect theoretical phason models with experimental observations in realistic materials.
  • Explore atomic mechanisms behind high-temperature behavior in quasicrystals.

Main Methods:

  • Experimental studies on an Al-Pd-Ru quasicrystal and its approximants.
  • Molecular simulations to model atomic behavior at high temperatures.
  • Analysis of atomic diffusion paths and rearrangements.

Main Results:

  • Observed discontinuous-like jumps in aluminum atom diffusion at high temperatures.
  • Linked aluminum diffusion paths to hyperatomic-fluctuations-associated phason rearrangements.
  • Provided a mechanistic explanation for the heat capacity anomaly.

Conclusions:

  • The high-temperature heat capacity anomaly in quasicrystals originates from hyperatomic fluctuations.
  • These fluctuations are associated with diffusive Nambu-Goldstone modes of phasons.
  • This study bridges the gap between theory and experiment for quasicrystal properties.