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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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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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Types Of Superconductors01:28

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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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.
CFT focuses on...
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Giant Mechanocaloric Effects in Fluorite-Structured Superionic Materials.

Claudio Cazorla, Daniel Errandonea1

  • 1Departamento de Física Aplicada (ICMUV), Malta Consolider Team, Universitat de Valencia , 46100 Burjassot, Spain.

Nano Letters
|April 13, 2016
PubMed
Summary
This summary is machine-generated.

Fast ion conductors (FIC) exhibit giant mechanocaloric effects, showing potential for solid-state cooling. Applying tensile stress can significantly reduce their transition temperature, enabling efficient temperature changes.

Keywords:
Fast-ion conductordensity functional theorymolecular dynamicssolid-state cooling

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Thermodynamics

Background:

  • Mechanocaloric materials change temperature under adiabatic mechanical stress.
  • Ferroelectrics and superelastic alloys are known mechanocaloric materials for solid-state cooling.
  • Fast ion conductors (FIC) are multicomponent materials with a critical temperature (Ts) where ionic mobility increases.

Purpose of the Study:

  • To investigate mechanocaloric effects in fast ion conductors (FIC).
  • To explore the potential of FIC for solid-state refrigeration applications.
  • To demonstrate that FIC can exhibit giant mechanocaloric effects.

Main Methods:

  • First-principles simulations
  • Molecular dynamics simulations
  • Analysis of superionic transitions and entropy changes
  • Investigation of stress effects on transition temperature (Ts)

Main Results:

  • Giant mechanocaloric effects were observed in fluorite-structured FIC.
  • The superionic transition in FIC involves a large entropy increase (~10^2 JK⁻¹kg⁻¹).
  • Hydrostatic, biaxial, and uniaxial stresses can tune the superionic transition.
  • Tensile stress reduces Ts by hundreds of degrees due to decreased Frenkel pair defect formation energy.
  • Predicted adiabatic temperature changes in CaF2 and PbF2 are ~10^2 K and ~10^1 K, respectively.

Conclusions:

  • Fast ion conductors (FIC) represent a new class of promising mechanocaloric materials.
  • FIC offer significant potential for future solid-state refrigeration technologies.
  • Stress-induced tuning of the superionic transition is key to their mechanocaloric performance.