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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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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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Crystal Field Theory
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CFT focuses on...
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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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Pressure induced weakness of electrostatic interaction and solid decomposition in Cs-I compounds.

Yanlei Geng1, Jianfu Li1, Zhaobin Zhang1

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Under high pressure, cesium iodide (CsI) compounds unexpectedly decompose into elemental cesium and iodine. This decomposition is driven by weakening electrostatic interactions, offering new insights into alkali metal halide behavior under extreme conditions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Alkali metal halides are crucial materials with diverse applications.
  • Understanding their behavior under extreme conditions, such as high pressure, is essential for scientific advancement.

Purpose of the Study:

  • To systematically investigate the crystal structure stability of cesium iodide (CsI) compounds under high pressures (0-500 GPa).
  • To elucidate the physical mechanism behind the pressure-induced decomposition of CsI compounds.

Main Methods:

  • First-principles calculations were employed to explore material properties.
  • The CALYPSO structure search technique was utilized to predict new phases and assess stability.
  • Analysis of enthalpy of formation and interatomic interactions provided mechanistic insights.

Main Results:

  • Several new CsI phases with varying stoichiometries were predicted.
  • A counter-intuitive decomposition of CsI into elemental Cs and I solids under pressure was observed.
  • Weakening electrostatic interactions were identified as the primary driver of decomposition, with covalent interactions playing a minor role.
  • The decrease in enthalpy of formation (ΔH) was attributed to a reduction in internal energy difference (ΔU).

Conclusions:

  • The study reveals a novel high-pressure decomposition mechanism for CsI driven by electrostatic interactions.
  • Findings offer valuable insights into the high-pressure properties and phase stability of alkali metal halides.
  • The observed phenomenon of high-pressure charge transfer and decomposition may stimulate new research directions in materials science and geology.