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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
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Experimental observation of carousel-like phason flips in the decagonal quasicrystal Al<sub>60</sub>Cr<sub>20</sub>Fe<sub>10</sub>Si<sub>10</sub>.

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High-temperature structural study of decagonal Al-Cu-Rh.

Pawel Kuczera1, Janusz Wolny1, Walter Steurer2

  • 1AGH University of Science and Technology, al. Mickiewicza 30, Krakow, Poland.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|March 29, 2014
PubMed
Summary

This study investigated decagonal aluminum-copper-rhodium (Al-Cu-Rh) quasicrystals at various temperatures. Findings suggest phasonic entropy does not significantly impact the stability of this phase.

Keywords:
decagonal quasicrystalhigh-temperature structurestabilization mechanism

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Quasicrystals, particularly decagonal phases like Al-Cu-Rh, exhibit unique atomic structures.
  • Understanding the factors influencing quasicrystal stability, such as energy and entropy, is crucial for materials design.
  • The role of phasonic disorder in the thermodynamic stability of quasicrystals remains an active area of research.

Purpose of the Study:

  • To investigate the temperature dependence of the decagonal Al-Cu-Rh structure.
  • To evaluate the contribution of phasonic entropy to the stabilization of quasicrystals.
  • To compare the thermal behavior of decagonal Al-Cu-Rh with other complex intermetallic phases.

Main Methods:

  • In-situ single-crystal X-ray diffraction was employed to study the Al-Cu-Rh structure at temperatures ranging from 293 K to 1223 K.
  • Comparative structure refinements were performed using a common set of 1460 unique reflections across all tested temperatures.
  • Analysis focused on structural parameters and the phasonic displacement parameter to assess temperature-induced changes.

Main Results:

  • The optimal quasiperiodic ordering for decagonal Al-Cu-Rh was suggested to occur between 1083 K and 1153 K.
  • No significant variations in refined structures or the phasonic displacement parameter were observed with changing temperature.
  • The phasonic contribution to entropy was found to be negligible in the stability of this decagonal phase.

Conclusions:

  • The stability of the decagonal Al-Cu-Rh phase is not significantly influenced by phasonic entropy.
  • This behavior aligns with that observed in other complex intermetallic high-temperature phases.
  • The findings suggest that other forms of structural disorder are more critical for the stability of this quasicrystal system.