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Related Concept Videos

Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

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.
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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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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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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7&#8722;&#948;/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
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Cation composition effects on oxide conductivity in the Zr(2)Y(2)O(7)-Y(3)NbO(7) system.

Dario Marrocchelli1, Paul A Madden, Stefan T Norberg

  • 1School of Chemistry, University of Edinburgh, Edinburgh EH9 3JJ, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 12, 2011
PubMed
Summary

This study used molecular dynamics simulations to investigate ionic conductivity in a disordered fluorite crystal system. Cation composition significantly impacts conductivity and lattice disorder, with Nb(5+) content decreasing conductivity.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Computational Materials Science

Background:

  • Ionic conductivity in oxide ceramics is crucial for applications like solid oxide fuel cells.
  • The Zr(2)Y(2)O(7)-Y(3)NbO(7) system exhibits a disordered fluorite structure with potential for ionic conduction.
  • Understanding the relationship between cation composition, lattice disorder, and ionic transport is essential for material design.

Purpose of the Study:

  • To investigate the effect of cation composition on ionic conductivity in the Zr(2)Y(2)O(7)-Y(3)NbO(7) system using molecular dynamics (MD) simulations.
  • To correlate dynamical properties with the degree of lattice disorder.
  • To elucidate the role of cation charges and sizes in influencing vacancy ordering and conductivity.

Main Methods:

  • Employing polarizable interaction potentials, parameterized using ab initio electronic structure calculations.
  • Conducting molecular dynamics simulations across the composition range of the Zr(2)Y(2)O(7)-Y(3)NbO(7) system.
  • Performing additional calculations with equalized cation charges to isolate the effects of charge and size.

Main Results:

  • Simulations reproduced the observed decrease in ionic conductivity and increase in lattice disorder with rising Nb(5+) content.
  • Cation charges and relative sizes were identified as key factors influencing vacancy ordering and conductivity trends.
  • Discrepancies were noted for Y(3)NbO(7), with overestimated conductivity and un-reproduced diffuse scattering features, suggesting limitations in the model.

Conclusions:

  • Cation composition critically influences ionic conductivity and lattice disorder in the studied system.
  • The random cation distribution model captures major trends, but cation ordering effects, particularly in Y(3)NbO(7), need further investigation.
  • Preliminary analysis indicates that partial cation ordering significantly impacts vacancy ordering propensity, affecting ionic transport.