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Discovery of Cu3Pb.

Alexandra D Tamerius1, Samantha M Clarke2, Mingqiang Gu3

  • 1Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA.

Angewandte Chemie (International Ed. in English)
|September 26, 2018
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Summary

Researchers discovered Cu3Pb, the first intermetallic compound in the copper-lead system, using high-pressure synthesis. This new material may exhibit unique topological properties, opening avenues for advanced materials science.

Keywords:
X-ray crystallographydiamond anvil cellshigh-pressure synthesisintermetallic compoundsmetastable materials

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Crystallography

Background:

  • High-pressure synthesis is a key method for discovering novel material phases.
  • The copper-lead (Cu-Pb) system has not previously featured characterized intermetallic compounds.

Purpose of the Study:

  • To report the discovery of the first intermetallic compound in the Cu-Pb system.
  • To characterize the structure and properties of this new compound.

Main Methods:

  • High-pressure synthesis utilizing diamond anvil cells.
  • In situ monitoring of phase formation during synthesis.
  • X-ray diffraction for structural characterization.
  • Electronic structure computations.

Main Results:

  • The first intermetallic compound in the Cu-Pb system, Cu3Pb, was successfully synthesized.
  • Cu3Pb represents the first structurally characterized mid- to late-first-row transition-metal plumbide.
  • The crystal structure of Cu3Pb was determined and analyzed.
  • Electronic structure calculations indicated band crossings near the Fermi level.

Conclusions:

  • The discovery of Cu3Pb expands the known intermetallic compounds in the Cu-Pb system.
  • The high-pressure polymorph of lead is hypothesized as a prerequisite for Cu3Pb formation.
  • Chemically doped Cu3Pb shows potential as a topologically nontrivial material.