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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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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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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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Overview of Valence Bond Theory
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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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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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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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Low Dimensional String-like Relaxation Underpins Superionic Conduction in Fluorites and Related Structures.

Ajay Annamareddy1, Jacob Eapen1

  • 1Department of Nuclear Engineering North Carolina State University, Raleigh, NC 27695, USA.

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Summary
This summary is machine-generated.

Superionic conductors like fluorites exhibit fast ion conduction via string-like dynamical structures, not just ion population. Ionic conductivity correlates inversely with ion string lifetime, revealing heterogeneous dynamics.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Condensed matter physics

Background:

  • Superionic conductors with a Faraday transition show increased ionic conductivity with temperature.
  • Fluorite structures have been extensively studied for decades, yet the mechanism of superionicity remains unclear.
  • Traditional models focus on quasi-static defects, failing to fully explain fast ion transport.

Purpose of the Study:

  • To investigate the fundamental nature of superionicity in fluorite structures.
  • To provide evidence for dynamical structures governing fast ion conduction.
  • To resolve long-standing disagreements on defect structures and ionic transport mechanisms.

Main Methods:

  • Analysis of dynamical structures beyond the traditional quasi-static defect framework.
  • Investigating the relationship between temperature, string dynamics, and ionic conductivity.
  • Correlating ionic conductivity with ion string lifetime and population.

Main Results:

  • Weighty evidence for string-like dynamical structures controlling fast ion conduction in fluorites.
  • Observed heterogeneous dynamics: lower temperatures promote longer, slower-relaxing strings.
  • Ionic conductivity is inversely correlated with the lifetime of ions in strings, not their population.

Conclusions:

  • String-like dynamical structures are key to fast ion conduction in fluorites.
  • Heterogeneous dynamics, characterized by temperature-dependent string behavior, govern superionicity.
  • The developed analysis methodology can be applied to other low-dimensional superionic conductors.