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Shock Synthesis of Decagonal Quasicrystals.

J Oppenheim1, C Ma1, J Hu1

  • 1Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd. M/C170-25, Pasadena, CA, 91125, USA.

Scientific Reports
|November 17, 2017
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Summary
This summary is machine-generated.

Scientists synthesized decagonal quasicrystals, similar to those found in the Khatyrka meteorite, using a novel shock recovery experiment. This research sheds light on quasicrystal stability under extreme pressures.

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Area of Science:

  • Materials Science
  • Mineralogy
  • High-Pressure Physics

Background:

  • The Khatyrka meteorite contains both icosahedral and decagonal quasicrystals.
  • Previous shock experiments successfully synthesized icosahedral quasicrystals.

Purpose of the Study:

  • To synthesize decagonal quasicrystals, specifically decagonite (Al71Ni24Fe5), using a shock recovery experiment.
  • To investigate the stability of quasicrystals under high-pressure shock conditions.

Main Methods:

  • Shock recovery experiment using stacked Aluminum 2024 and permalloy 80 alloys within a stainless steel 304 chamber.
  • Chemical characterization via scanning electron microscopy and electron microprobe analysis.
  • Structural characterization using electron backscatter diffraction and transmission electron microscopy.

Main Results:

  • Abundant decagonal quasicrystals (Al73Ni19Fe4Cu2Mg0.6Mo0.4Mn0.3) were synthesized at the interface between shocked Al and permalloy.
  • The experiment also produced AlNiFe alloy with B2 structure and metastable Al9Ni2 phase.
  • Characterization confirmed the chemical and structural properties of the synthesized phases.

Conclusions:

  • The shock recovery experiment successfully synthesized decagonal quasicrystals, providing insights into their formation.
  • Findings contribute to understanding quasicrystal stability during high-pressure shock events.
  • This work aids in interpreting the complex phase assemblage observed in the Khatyrka meteorite.