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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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Tungsten Ditelluride: a layered semimetal.

Chia-Hui Lee1, Eduardo Cruz Silva2, Lazaro Calderin3

  • 11] Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States [2] Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania 16802, United States [3] Materials Research Institute, The Pennsylvania State University, University Park, United States.

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Tungsten ditelluride (WTe2) is metallic in its stable Td form, which oxidizes easily. This finding requires reevaluation of WTe2

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Tungsten ditelluride (WTe2) is a transition metal dichalcogenide (TMD) with unique electronic properties.
  • Decades of research have recently led to a clearer understanding of WTe2's structure and properties.

Purpose of the Study:

  • To experimentally and theoretically investigate the structure, dynamics, and electronic properties of WTe2.
  • To confirm the metallic nature of WTe2 and its preferred structural configuration.

Main Methods:

  • Experimental characterization of WTe2.
  • Theoretical investigations of WTe2's structure and dynamics.
  • Analysis of electronic transport properties.
  • Raman spectroscopy.

Main Results:

  • WTe2 adopts a distorted 1T structure (Td structure) in its minimum energy configuration.
  • The Td structure results in metallic-like transport properties.
  • New information on the Raman modes of Td-WTe2 was obtained.
  • Td-WTe2 was found to be susceptible to oxidation from environmental exposure.

Conclusions:

  • The metallic nature of WTe2 in its thermodynamically favored Td form is confirmed.
  • The environmental instability of Td-WTe2 due to oxidation is demonstrated.
  • The suitability of WTe2 for electronic devices like field-effect transistors may need reevaluation in its Td form.