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Colors and Magnetism03:02

Colors and Magnetism

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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...
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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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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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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.
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Tetrahedral Complexes
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Magnetostructural Transition in Spin Frustrated Halide Double Perovskites.

Kunpot Mopoung1, Quanzheng Tao1,2, Fabio Orlandi3

  • 1Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-58183, Linköping, Sweden.

Chemistry of Materials : a Publication of the American Chemical Society
|September 29, 2025
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Summary

Geometrical frustration in face-centered-cubic lattices is complex. This study reveals that magnetoelastic coupling strength dictates the magnetic ground state in halide double perovskites, influencing structural transitions and antiferromagnetic ordering.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Geometrical frustration in face-centered-cubic (fcc) lattices complicates antiferromagnetic ordering.
  • The ground state is highly sensitive to competing magnetic interactions and structural symmetry.

Purpose of the Study:

  • Investigate the magnetostructural interplay in Cs2NaFeCl6 and Cs2AgFeCl6 halide double perovskites.
  • Determine how magnetoelastic coupling influences magnetic ground states and structural transitions.

Main Methods:

  • Neutron diffraction to determine antiferromagnetic structures.
  • Polarized Raman spectroscopy and thermal expansion measurements for structural analysis.
  • Density functional theory (DFT) calculations for theoretical insights.

Main Results:

  • Cs2NaFeCl6 adopts AFM-III order (J1-J2 mechanism) with minimal distortion.
  • Cs2AgFeCl6 exhibits AFM-I order with significant tetragonal distortion.
  • Anomalous lattice expansion observed at magnetic transitions, stronger in Cs2AgFeCl6.

Conclusions:

  • Magnetoelastic coupling strength is the primary determinant of magnetic ground state selection.
  • Strong coupling in Cs2AgFeCl6 drives tetragonal distortion, stabilizing AFM-I.
  • Weak coupling in Cs2NaFeCl6 leads to minimal distortion, favoring AFM-III via J1-J2 interactions.