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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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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.
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Plainly fixing crystal lattices.

In Chung1,2

  • 1School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea.

Science (New York, N.Y.)
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Summary
This summary is machine-generated.

This study introduces a novel thermoelectric alloy designed for advanced electronic cooling applications. The material demonstrates high performance, paving the way for more efficient thermal management solutions.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Thermodynamics

Background:

  • Electronic devices generate significant heat, necessitating efficient thermal management.
  • Thermoelectric materials offer a solid-state solution for heat dissipation.
  • Current thermoelectric alloys face limitations in performance and efficiency.

Purpose of the Study:

  • To develop and characterize a novel thermoelectric alloy with enhanced cooling performance.
  • To evaluate the alloy's potential for practical applications in electronic cooling systems.

Main Methods:

  • Synthesis and processing of the thermoelectric alloy.
  • Measurement of key thermoelectric properties (Seebeck coefficient, electrical conductivity, thermal conductivity).
  • Performance evaluation under simulated electronic cooling conditions.

Main Results:

  • The developed thermoelectric alloy exhibits a high figure of merit (ZT), indicating superior thermoelectric performance.
  • Achieved significant heat pumping capacity, outperforming existing materials.
  • Demonstrated excellent stability and durability.

Conclusions:

  • The novel thermoelectric alloy represents a significant advancement in materials for electronic cooling.
  • This material has the potential to enable more compact, efficient, and reliable electronic devices.
  • Further research can explore large-scale manufacturing and integration into cooling systems.