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Related Concept Videos

Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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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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.
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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.
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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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Trends in Lattice Energy: Ion Size and Charge

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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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Related Experiment Video

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Soft Phonon Mode Triggering Fast Ag Diffusion in Superionic Argyrodite Ag8 GeSe6.

Xingchen Shen1,2,3, Michael Marek Koza4, Yung-Hsiang Tung5,6

  • 1Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|August 18, 2023
PubMed
Summary

Superionic Argyrodites exhibit dual sublattices, enabling low thermal conductivity for energy applications. Heating softens phonons, triggering fast silver ion diffusion, crucial for understanding these advanced materials.

Keywords:
fast diffusionneutron scatteringsoft phononssuperionic argyroditesthermoelectrics

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Energy Storage

Background:

  • Superionic Argyrodites possess unique dual sublattices (rigid and mobile) contributing to desirable properties like low thermal conductivity and good ionic/electrical conductivity.
  • These properties make Argyrodites promising for energy applications, including batteries, fuel cells, and thermoelectrics.
  • A detailed understanding of the interplay between lattice dynamics (phonons) and ion diffusion in these materials is currently lacking.

Purpose of the Study:

  • To investigate the microscopic mechanisms governing lattice and diffusive dynamics in superionic Argyrodites.
  • To elucidate the relationship between phonon behavior and mobile ion diffusion.
  • To provide a comprehensive understanding of the intertwined dynamics in Ag8GeSe6.

Main Methods:

  • Inelastic neutron scattering (INS) was utilized to probe phonon behavior and ion dynamics.
  • Ab initio molecular dynamics (AIMD) simulations were performed to complement experimental findings.
  • AIMD simulations were used to reproduce experimental INS signals and model ion diffusion.

Main Results:

  • Phonon softening was observed upon heating to approximately 350 K (Tc).
  • This phonon softening was identified as the trigger for fast silver (Ag) diffusion.
  • AIMD simulations confirmed partially ultrafast Ag diffusion with a high diffusion coefficient (10^-4 cm^-2 s^-1).

Conclusions:

  • A direct microscopic link between soft phonons and mobile ion behavior was established.
  • The study provides a paradigm for understanding the coupled lattice and diffusive dynamics in superionic materials.
  • This research deepens the understanding of Argyrodite materials for advanced energy applications.