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Related Concept Videos

Qualitative Analysis03:46

Qualitative Analysis

For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
Ionic Bonding and Electron Transfer02:48

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.
Ionic Association01:28

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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...
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.

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Related Experiment Video

Updated: Jun 23, 2026

Fluid-cell Raman Spectroscopy for operando Studies of Reaction and Transport Phenomena during Silicate Glass Corrosion
06:48

Fluid-cell Raman Spectroscopy for operando Studies of Reaction and Transport Phenomena during Silicate Glass Corrosion

Published on: May 9, 2025

Barium diffusion in mixed cation glasses.

M Grofmeier1, F V Natrup, H Bracht

  • 1Institut für Materialphysik and Sondeforschungsbereich 458 (DFG), Westfälische Wilhelms-Universität, Münster, Wilhelm-Klemm-Str. 0, D-48149 Münster, Germany.

Physical Chemistry Chemical Physics : PCCP
|May 26, 2009
PubMed
Summary
This summary is machine-generated.

Barium diffusion in mixed cation glasses shows increased mobility with higher alkali content. This suggests elastic and electrostatic interactions influence cation movement, though the exact correlation remains unexplained.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Glass Science

Background:

  • Alkaline-earth ion diffusion in silicate glasses is crucial for understanding material properties.
  • Previous studies indicated calcium mobility in soda-lime glasses correlates with alkali content.
  • Understanding cation diffusion mechanisms is key to designing advanced glass materials.

Purpose of the Study:

  • To investigate barium diffusion in mixed sodium-barium and potassium-barium silicate glasses.
  • To determine the influence of alkali content and type on alkaline-earth ion mobility.
  • To elucidate the contributions of elastic and electrostatic interactions to cation diffusion.

Main Methods:

  • Radiotracer diffusion technique was employed to measure barium diffusion coefficients.
  • Experiments were conducted below the glass transition temperatures of the investigated glasses.
  • Glass compositions included varying ratios of Na2O, BaO, K2O, and SiO2.

Main Results:

  • Barium ion mobility increased with higher alkali (Na+, K+) content in the silicate glass network.
  • Diffusion activation enthalpy showed a distinct dependence on the type and concentration of alkali ions.
  • A correlation was observed between the pre-exponential factor of alkaline-earth ion diffusion and glass composition.

Conclusions:

  • Alkali content significantly impacts alkaline-earth ion mobility in mixed cation glasses.
  • Elastic and electrostatic interactions play a role in cation diffusion mechanisms.
  • The observed correlation in pre-exponential factors suggests complex interactions within the glass structure.