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Related Concept Videos

Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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:
Lattice Energies of Ionic Crystals01:27

Lattice Energies of Ionic Crystals

Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Compressed correlation functions and fast aging dynamics in metallic glasses.

B Ruta1, G Baldi, G Monaco

  • 1European Synchrotron Radiation Facility, BP220, F-38043 Grenoble, France. ruta@esrf.fr

The Journal of Chemical Physics
|February 15, 2013
PubMed
Summary

Atomic dynamics in metallic glass exhibit universal, non-diffusive behavior. X-ray photon correlation spectroscopy reveals compressed correlation functions, suggesting a master curve for glassy dynamics across various conditions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Amorphous Materials

Background:

  • Metallic glasses exhibit complex dynamics below their glass transition temperature.
  • Understanding atomic motion is crucial for predicting material properties and behavior.

Purpose of the Study:

  • To investigate the atomic dynamics in a Zr(67)Ni(33) metallic glass using x-ray photon correlation spectroscopy.
  • To characterize the nature of density fluctuations and aging phenomena in the deep glassy state.

Main Methods:

  • Utilized x-ray photon correlation spectroscopy (XPCS) to measure atomic dynamics.
  • Analyzed density fluctuations using correlation functions.
  • Applied the Kohlrausch-Williams-Watts function to model the observed dynamics.

Main Results:

  • Observed compressed, non-exponential correlation functions, well-described by the Kohlrausch-Williams-Watts function with a shape exponent β > 1.
  • Found the shape exponent to be independent of waiting time and wave-vector, enabling master curve scaling.
  • Identified aging regimes persisting in the deep glassy state, suggesting universal behavior.

Conclusions:

  • The atomic dynamics in metallic glasses are characterized by compressed correlation functions and aging phenomena, suggesting a nondiffusive nature.
  • The observed universality allows for master curve scaling and description by a unique model function for structural relaxation time.
  • These findings provide insights into the fundamental behavior of glassy systems.