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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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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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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.
Types of Unit Cells
Imagine taking a large number of identical...
9.8K
Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

46.2K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
46.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.5K
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...
14.5K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Layer-resolved electronic behavior in a Kondo lattice system, CeAgAs2.

Sawani Datta1, Ram Prakash Pandeya1, Arka Bikash Dey2

  • 1Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 20, 2023
PubMed
Summary
This summary is machine-generated.

We explored the electronic structure of the antiferromagnetic Kondo lattice system CeAgAs2 using hard X-ray photoemission spectroscopy. Our findings reveal significant surface-bulk differences and complex electronic interactions within this novel material.

Keywords:
Kondo lattice systemfinal state effecthard x-ray photoemissionsurface-bulk electronic structuretopological material

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spectroscopy

Background:

  • CeAgAs2 is an orthorhombic variant of the HfCuSi2 structure.
  • It exhibits an antiferromagnetic ground state, Kondo-like resistivity upturn, and magnetic moment compensation at low temperatures.

Purpose of the Study:

  • To investigate the electronic structure of the antiferromagnetic Kondo lattice system CeAgAs2.
  • To understand the surface-bulk electronic differences and the role of hybridization and electron correlation.

Main Methods:

  • Hard X-ray photoemission spectroscopy (HAXPES) was employed.
  • Depth-resolved measurements were performed at varying photon energies.

Main Results:

  • Significant surface-bulk differences were observed in As and Ce core-level spectra.
  • Strong Ce-As hybridization and electron correlation were identified.
  • Temperature-dependent changes in spectral weight transfer and Fermi level intensity were consistent with Kondo behavior.

Conclusions:

  • The study reveals distinct electronic structures between the surface and bulk of CeAgAs2.
  • Complex interplay of intra- and inter-layer covalency and electron correlation influences the electronic properties.
  • These findings provide insights into the novel Kondo lattice system CeAgAs2.