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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...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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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Unit Cells01:18

Unit Cells

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A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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Valence Bond Theory02:42

Valence Bond Theory

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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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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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Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Single crystal study of antiferromagnetic CePd3Al9.

R E Baumbach1, B L Scott, F Ronning

  • 1Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 12, 2013
PubMed
Summary

The new tetragonal compound CePd3Al9 exhibits antiferromagnetic order near 0.9 K, suggesting a dilute Kondo lattice behavior. Structural disorder influences its magnetic and electronic properties.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Crystallography

Background:

  • Cerium-based intermetallic compounds are crucial for understanding complex magnetic phenomena.
  • Kondo lattice systems exhibit unique electronic and magnetic properties due to the interaction between localized f-electrons and conduction electrons.

Purpose of the Study:

  • To synthesize and characterize a new tetragonal compound, CePd3Al9.
  • To investigate the magnetic, thermodynamic, and transport properties of CePd3Al9.
  • To determine the nature of the magnetic ordering and electronic behavior in this material.

Main Methods:

  • Single crystal X-ray diffraction for structural determination.
  • Magnetic susceptibility (M), heat capacity (C), and electrical resistivity (ρ) measurements.
  • Analysis of Ce-Ce distances and electronic specific heat coefficient (γ).

Main Results:

  • CePd3Al9 crystallizes in a new structure type with large Ce-Ce distances (5.272 Å).
  • Antiferromagnetic order was observed near T(N) = 0.9 K.
  • Evidence suggests a dilute Kondo lattice with weak Ce-conduction electron hybridization and significant structural disorder.

Conclusions:

  • CePd3Al9 behaves as a stoichiometric dilute Kondo lattice with localized Ce ions.
  • The magnetic ground state is influenced by weak hybridization and structural disorder.
  • Magnetic field application leads to Zeeman splitting and a transition to a nonmagnetic singlet state.