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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

14.6K
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.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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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Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
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Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
63.9K
Precipitation Reactions03:10

Precipitation Reactions

51.3K
In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.4K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Related Experiment Video

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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

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A Novel Interstitial Site in Binary Rock-Salt Compounds.

Neeraj Mishra1, Guy Makov1

  • 1Department of Materials Engineering, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.

Materials (Basel, Switzerland)
|September 9, 2022
PubMed
Summary
This summary is machine-generated.

A new stable interstitial site for anion defects in binary rock-salt materials was discovered. This base-interstitial site is energetically competitive and impacts material conductivity, advancing defect understanding.

Keywords:
defect energeticselectronic structureinterstitialsrocksalt

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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Computational Materials Science

Background:

  • Interstitial point defects significantly influence the properties of binary rock-salt materials.
  • Understanding defect energetics and stability is crucial for predicting material behavior.

Purpose of the Study:

  • To investigate the energetic and mechanical stability of interstitial point defects in binary rock-salt materials.
  • To identify novel interstitial sites and compare their stability with known sites.
  • To analyze the impact of these defects on the electronic band structure and conductivity.

Main Methods:

  • Utilized first-principles calculations to model defect structures and energetics.
  • Compared formation energies of newly identified base-interstitial defects with traditional tetrahedral (body) and split interstitials.
  • Analyzed electronic band structures and Fermi level shifts to determine conductivity implications.

Main Results:

  • A novel, stable, and energetically competitive base-interstitial site for anion interstitials in rock-salts was identified.
  • Base-interstitial sites showed highly competitive formation energies, particularly in alkali halides and silver bromide, alongside <110> split interstitials.
  • Defect presence shifts Fermi levels, indicating p-type conductivity in metal halides but no preferred conductivity in metal monochalcogenides.
  • The base-interstitial forms a triatomic entity with lattice anions, influencing electronic structure.

Conclusions:

  • The discovery of the base-interstitial site offers a new perspective on defect behavior in binary rock-salt materials.
  • This site is a predominant interstitial configuration in certain materials like alkali halides.
  • Understanding these defects is key to tailoring thermodynamic and kinetic properties for specific applications.