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Related Concept Videos

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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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...
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Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...

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Metastable Cd4Sb3: a complex structured intermetallic compound with semiconductor properties.

Andreas Tengå1, Sven Lidin, Jean-Philippe Belieres

  • 1Inorganic Chemistry, Stockholm University, SE-10691 Stockholm, Sweden.

Journal of the American Chemical Society
|November 14, 2008
PubMed
Summary
This summary is machine-generated.

The metastable intermetallic compound Cadmium-Antimony (Cd4Sb3) was synthesized and characterized, revealing its narrow-gap semiconductor properties and exceptionally low thermal conductivity. This material exhibits a reversible order-disorder transition and decomposes at higher temperatures.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Condensed Matter Physics

Background:

  • The binary intermetallic compound Cadmium-Antimony (Cd4Sb3) is a metastable phase.
  • Understanding its structural and electronic properties is crucial for potential thermoelectric applications.

Purpose of the Study:

  • To synthesize and characterize the metastable Cd4Sb3 compound.
  • To investigate its structural, thermal, and electronic properties, including phase transitions and thermoelectric behavior.

Main Methods:

  • Stoichiometric Cd-Sb melts were quenched to obtain polycrystalline ingots.
  • Millimeter-sized crystals were grown using bismuth (Bi) or tin (Sn) fluxes.
  • X-ray diffraction was used to determine crystal structure and phase transitions.
  • Electrical resistivity and thermopower measurements were conducted over a temperature range.
  • Thermal conductivity was measured to assess heat transport properties.

Main Results:

  • Cd4Sb3 crystallizes in a monoclinic structure (space group Pn) with formula unit Cd13Sb10.
  • A reversible order-disorder transition occurs at 373 K, with the disordered phase being rhombohedral.
  • The compound exhibits narrow-gap semiconductor behavior with a unique temperature dependence of resistivity.
  • Low thermal conductivity, below 1 W/mK above 130 K, was observed, comparable to amorphous materials.
  • Flux-grown samples doped with Sn showed significantly increased thermopower and resistivity.

Conclusions:

  • Cd4Sb3 is a structurally complex metastable intermetallic compound with promising thermoelectric properties due to its low thermal conductivity.
  • The observed order-disorder transition and semiconductor characteristics warrant further investigation for thermoelectric device applications.
  • The influence of dopants like tin on thermoelectric performance highlights potential for material optimization.