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Ferromagnetism01:31

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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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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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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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Colors and Magnetism03:02

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Color in Coordination 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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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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The Local-Scale Origin of Ferroic Properties in BiVO4.

Bryce G Mullens1,2, Frederick P Marlton3, Helen E A Brand4

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|February 19, 2025
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Earth-abundant metal oxides like bismuth vanadate (BiVO4) show promise for photocatalysis. This study reveals hidden local distortions in BiVO4, linked to its polar properties and electron lone pairs, opening avenues for new material design.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Earth-abundant metal oxides are cost-effective and stable for photocatalysis.
  • Bismuth vanadate (BiVO4) exhibits favorable band gaps and unique polar properties despite a centrosymmetric structure.
  • Conventional crystallography often overlooks local-scale features influencing material properties.

Purpose of the Study:

  • To investigate the origin of polar properties in centrosymmetric materials like BiVO4.
  • To explore how local-scale distortions, influenced by electron lone pairs, affect material characteristics.
  • To demonstrate the potential for engineering photocatalytic and polar materials from centrosymmetric compounds.

Main Methods:

  • High-resolution synchrotron X-ray powder diffraction to observe anomalous peak shapes.
  • Neutron total scattering to analyze temperature-dependent local-scale distortions.
  • Analysis of Bi3+ 6s2 electron lone pair contributions to structural and electronic properties.

Main Results:

  • Anomalous peak shapes in BiVO4 diffraction data indicate deviations from ideal centrosymmetry.
  • Local-scale distortions, particularly those involving Bi3+ lone pairs, were identified and quantified.
  • A correlation was established between these local distortions and the observed polar properties of BiVO4.

Conclusions:

  • Centrosymmetric materials with s2 and d0 cations can exhibit 'hidden' local-scale polar features.
  • The polar properties of BiVO4 are attributed to local distortions induced by Bi3+ electron lone pairs.
  • Engineering interatomic distances related to lone pair cations offers a new strategy for designing advanced photocatalytic and polar materials.