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Related Concept Videos

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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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Predicting Molecular Geometry02:27

Predicting Molecular Geometry

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VSEPR Theory for Determination of Electron Pair Geometries
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Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

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Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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Metallic Ternary Telluride with Sphalerite Superstructure.

Amit Adhikary, Sudip Mohapatra, Seng Huat Lee

  • 1Department of Physics and Astronomy, University of Missouri-Kansas City , Kansas City, Missouri 64110, United States.

Inorganic Chemistry
|February 19, 2016
PubMed
Summary

A new ternary compound, Cu5Sn2Te7, was synthesized and exhibits high electrical conductivity due to its metallic properties. Theoretical calculations suggest a potential semiconducting material, Cu4ZnSn2Te7, with a band gap of 0.5 eV.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Inorganic Chemistry

Background:

  • Ternary compounds offer tunable properties for advanced applications.
  • Understanding structure-property relationships is crucial for novel material discovery.
  • Sphalerite superstructures with unique atomic arrangements are of significant research interest.

Purpose of the Study:

  • To synthesize and characterize a new ternary compound, Cu5Sn2Te7.
  • To investigate the structural, electrical, and thermoelectric properties of Cu5Sn2Te7.
  • To explore theoretical modifications for potential semiconducting applications.

Main Methods:

  • Stoichiometric reaction of copper (Cu), tin (Sn), and tellurium (Te).
  • X-ray diffraction for crystallographic analysis (C2 space group).
  • Electrical conductivity, Seebeck coefficient, and Hall effect measurements.
  • Electronic band structure calculations.

Main Results:

  • Cu5Sn2Te7 synthesized with specific unit cell parameters and an adamantane-like structure.
  • High electrical conductivity (9.8 × 10^5 S m^-1) and p-type metallic behavior confirmed.
  • Small effective mass of hole states contributes to high charge carrier mobility.
  • Poor thermoelectric figure of merit (ZT) due to high thermal conductivity and low Seebeck coefficient.

Conclusions:

  • Cu5Sn2Te7 is a p-type metallic conductor with promising charge transport properties.
  • The compound's thermoelectric performance is limited by its thermal conductivity.
  • Theoretical substitution of Cu with Zn could yield a semiconducting material (Cu4ZnSn2Te7) with a ~0.5 eV band gap.