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Related Concept Videos

Common Ion Effect03:24

Common Ion Effect

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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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Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
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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.
Ionic Crystal Structures02:42

Ionic Crystal Structures

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.
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

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Atom Probe Tomography Studies on the Cu(In,Ga)Se2 Grain Boundaries
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Stable cation inversion at the MgAl2O4(100) surface.

Morten K Rasmussen1, Adam S Foster, Berit Hinnemann

  • 1Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark.

Physical Review Letters
|August 16, 2011
PubMed
Summary
This summary is machine-generated.

Researchers uncovered the atomic structure of the insulating MgAl2O4 (spinel) surface. They found a stable surface structure with aluminum atoms replacing magnesium, forming integral Mg-Al antisites.

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Area of Science:

  • Materials Science
  • Surface Science
  • Solid-State Chemistry

Background:

  • Understanding the surface structure of ternary metal oxides is crucial for their applications.
  • Magnesium aluminate spinel (MgAl2O4) is an important insulating material with diverse uses.
  • Defects like Mg-Al antisites are known in bulk MgAl2O4 but their surface behavior is less understood.

Purpose of the Study:

  • To determine the atomic-scale structure of the MgAl2O4(100) surface.
  • To investigate the surface termination and the presence of defects.
  • To elucidate the thermodynamic stability of surface structures and defects.

Main Methods:

  • Atom-resolved noncontact atomic force microscopy (NC-AFM) for high-resolution surface imaging.
  • Surface X-ray diffraction (SXRD) for precise structural determination.
  • Density functional theory (DFT) calculations for thermodynamic analysis and atomic simulations.

Main Results:

  • The MgAl2O4(100) surface is terminated by an aluminum and oxygen-rich structure.
  • A significant and thermodynamically favored intermixing of Al and Mg atoms occurs at the surface.
  • Mg-Al antisites, typically considered bulk defects, are found to be a stable and integral part of the surface structure.

Conclusions:

  • The (100) surface of MgAl2O4 exhibits a unique atomic arrangement distinct from the bulk.
  • Surface Mg-Al antisites are thermodynamically stable and play a key role in the surface termination.
  • This detailed structural understanding provides insights into the surface properties and reactivity of MgAl2O4.