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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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. Many...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
Valence Bond Theory02:42

Valence Bond Theory

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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Pressure-induced disordered substitution alloy in Sb2Te3.

Jinggeng Zhao1, Haozhe Liu, Lars Ehm

  • 1Natural Science Research Center, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, China.

Inorganic Chemistry
|October 20, 2011
PubMed
Summary

Researchers discovered a new disordered alloy of antimony telluride (Sb(2)Te(3)) under high pressure. This material exhibits unique structural changes, offering insights into topological insulator and thermoelectric properties.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Antimony telluride (Sb(2)Te(3)) is a known topological insulator and thermoelectric material.
  • Understanding the high-pressure behavior of such materials is crucial for exploring novel electronic and thermal properties.

Purpose of the Study:

  • To investigate the structural phase transitions of antimony telluride (Sb(2)Te(3)) under high-pressure conditions.
  • To characterize the new high-pressure phases and their crystallographic structures.

Main Methods:

  • In situ high-pressure angle-dispersive X-ray diffraction experiments were performed on Sb(2)Te(3) at room temperature.
  • Experiments were conducted across a range of pressures, including low-temperature studies down to approximately 13 K.

Main Results:

  • A new disordered substitution alloy of Sb and Te was discovered above 15.1 GPa.
  • Sb(2)Te(3) crystallized into a monoclinic structure (space group C2/m) above 15.1 GPa, distinct from Bi(2)Te(3).
  • Above 19.8 GPa, Sb(2)Te(3) adopted a body-centered-cubic structure with disordered atomic arrangements.

Conclusions:

  • Antimony telluride (Sb(2)Te(3)) exhibits unique high-pressure structural phases.
  • The observed phase transitions are consistent at both room temperature and low temperatures, indicating pressure-driven structural stability.