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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.
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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Paramagnetism

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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Magnetic order in Pu₂M₃Si₅ (M = Co, Ni).

E D Bauer1, P H Tobash, J N Mitchell

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

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 23, 2011
PubMed
Summary
This summary is machine-generated.

Two new plutonium compounds, Pu2Co3Si5 and Pu2Ni3Si5, exhibit complex magnetic ordering and electronic properties. These materials show distinct magnetic transitions and enhanced electronic behavior, offering insights into plutonium magnetism.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Actinide Chemistry

Background:

  • Plutonium compounds are of interest due to their complex electronic and magnetic properties.
  • Understanding the interplay between structure, magnetism, and electronic behavior in plutonium-based materials is crucial.

Purpose of the Study:

  • To synthesize and characterize two new plutonium silicide compounds, Pu2Co3Si5 and Pu2Ni3Si5.
  • To investigate their physical properties, including magnetic susceptibility, specific heat, and electrical resistivity.
  • To determine their crystal structures and magnetic ordering temperatures.

Main Methods:

  • Single-crystal X-ray diffraction for structural determination.
  • Magnetic susceptibility measurements to identify magnetic transitions.
  • Specific heat measurements to probe electronic and magnetic contributions.
  • Electrical resistivity measurements to understand charge transport properties.

Main Results:

  • Pu2Ni3Si5 crystallizes in the orthorhombic U2Co3Si5 structure type and exhibits ferromagnetic ordering at 65 K, followed by an antiferromagnetic transition at 35 K.
  • Pu2Co3Si5 adopts the monoclinic Lu2Co3Si5 type and shows two successive magnetic transitions at 38 K and 5 K.
  • Both compounds display a moderately enhanced Sommerfeld coefficient (γ ∼ 100 mJ/mol Pu K²) in their magnetic states, with comparable RKKY and Kondo energy scales.

Conclusions:

  • The study reveals novel crystal structures and complex magnetic behaviors in Pu2Co3Si5 and Pu2Ni3Si5.
  • The findings highlight the significant influence of electronic correlations and magnetic interactions in these plutonium compounds.
  • These results contribute to a deeper understanding of magnetism in actinide-based materials.