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Related Concept Videos

Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

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Electronic selection rules controlling dislocation glide in bcc metals.

Travis E Jones1, Mark E Eberhart, Dennis P Clougherty

  • 1Molecular Theory Group, Colorado School of Mines, Golden, Colorado 80401, USA. trjones@mines.edu

Physical Review Letters
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

Recent studies question structure-property relationships in bcc metals. Fully quantum mechanical relationships, involving electronic states and strain fields in screw dislocations, are now required for accurate low-temperature deformation behavior predictions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Structure-property relationships traditionally explain low-temperature deformation in bcc metals.
  • Previous models were semiclassical, based on atomistic simulations of transition metals.

Purpose of the Study:

  • To re-evaluate the validity of existing structure-property relationships for bcc metals.
  • To investigate the quantum mechanical underpinnings of low-temperature deformation behavior.

Main Methods:

  • Ab initio density functional theory calculations.
  • Atomistic simulations of isolated screw dislocations in Molybdenum (Mo) and Tantalum (Ta).

Main Results:

  • Recent ab initio studies challenge established semiclassical structure-property relationships.
  • A fully quantum mechanical approach is necessary, considering electronic state coupling with strain fields.
  • This is particularly relevant for the core of long a/<2111> screw dislocations.

Conclusions:

  • The governing structure-property relationships for low-temperature deformation in bcc metals are fundamentally quantum mechanical.
  • Accurate modeling requires incorporating the coupling between electronic states and the strain field at dislocation cores.
  • This finding necessitates a revision of traditional understanding in materials science and solid mechanics.