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Related Concept Videos

Boundary Conditions for Current Density01:25

Boundary Conditions for Current Density

Current density becomes discontinuous across an interface of materials with different electrical conductivities. The normal component of the current density is continuous across the boundary.
Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Electrostatic Boundary Conditions in Dielectrics01:27

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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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First Law: Particles in Two-dimensional Equilibrium

Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
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Evolution of Staircase Structures in Diffusive Convection
07:28

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High junction and twin boundary densities in driven dynamical systems.

X Ding1, Z Zhao, T Lookman

  • 1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China. dingxd@mail.xjtu.edu.cn

Advanced Materials (Deerfield Beach, Fla.)
|August 2, 2012
PubMed
Summary

Computer simulations reveal a new method to create device materials with high domain boundary densities by shearing. This technique yields higher twin densities than rapid quenching, producing stable patterns, especially in soft materials.

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Area of Science:

  • Materials Science
  • Computational Materials Science
  • Solid-State Physics

Background:

  • High domain boundary densities are crucial for advanced material properties.
  • Existing methods like rapid quenching have limitations in achieving desired densities.
  • Understanding domain formation mechanisms is key for material design.

Purpose of the Study:

  • To introduce a novel computational method for generating high domain boundary densities in materials.
  • To investigate the stability and characteristics of these generated domain patterns.
  • To compare the effectiveness of this new method against traditional techniques.

Main Methods:

  • Utilizing computer simulations to perform mechanical shearing on material samples.
  • Analyzing the resulting atomic structures to quantify twin densities.
  • Comparing results across materials with varying elastic properties and crystal sizes.

Main Results:

  • Shearing simulations successfully generated significantly higher twin densities compared to rapid quench methods.
  • The domain patterns formed through shearing were found to be highly stable.
  • Elastically soft materials exhibited greater twin densities than hard materials, even at the nanoscale.

Conclusions:

  • Mechanical shearing presents a novel and effective mechanism for creating materials with exceptionally high domain boundary densities.
  • The stability of these shear-induced domain patterns offers potential for advanced material applications.
  • Material's elastic properties play a significant role in the achievable twin density via this method.