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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 malleability....
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Isomerism in Complexes
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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Gold Polar Intermetallics: Structural Versatility through Exclusive Bonding Motifs.

Volodymyr Smetana1,2, Melissa Rhodehouse1,3, Gerd Meyer1,3

  • 1Ames Laboratory, U.S. Department of Energy, Iowa State University , Ames, Iowa 50011-3020, United States.

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Researchers are exploring new polar intermetallic compounds (PICs), focusing on gold

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Crystallography

Background:

  • Intermetallic phases are crucial for designing materials with specific properties.
  • Polar intermetallics (PICs) bridge Hume-Rothery phases and Zintl compounds, with unclear formation mechanisms.
  • PICs exhibit diverse crystal structures, incorporating features from nonpolar and Zintl compounds.

Purpose of the Study:

  • To discover and synthesize new polar intermetallic compounds.
  • To characterize their structures and investigate their properties.
  • To analyze the principles governing their formation and systematize existing knowledge.

Main Methods:

  • Focus on ternary intermetallic compounds of gold with metals from groups 12-15.
  • Analysis of relativistic effects on chemical bonding and structural motifs.
  • Systematic study of structure types, including common and novel formations.

Main Results:

  • Gold, with high electronegativity, often acts as an anion in PICs.
  • Relativistic effects in gold intermetallics lead to unique structural motifs.
  • Observed structures range from common types (e.g., AlB2) to complex networks and clusters.

Conclusions:

  • Polar intermetallics, especially those involving gold, offer a rich area for materials discovery.
  • Understanding structure-property relationships in PICs is key to designing advanced materials.
  • Systematization of PIC structures provides a foundation for future research.