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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...
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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent – the...
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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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Crystal symmetry operations are isometric transformations that map objects onto indistinguishable copies while preserving distances, angles, and volumes. The simplest symmetry operation is translation, which shifts the entire infinite crystal lattice parallelly by a translation vector.Crystallographic rotations involve rotations by an angle of 2π/n around an axis without changing the positions of points on the axis. It is called the rotational axis of the symmetry, denoted by n. The combination...
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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
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Published on: February 9, 2017

Strong crystal size effect on deformation twinning.

Qian Yu1, Zhi-Wei Shan, Ju Li

  • 1Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China.

Nature
|January 22, 2010
PubMed
Summary
This summary is machine-generated.

Deformation twinning in titanium alloys becomes harder with smaller sample sizes, eventually being replaced by dislocation plasticity below one micrometer. This size-dependent mechanical behavior is explained by a new

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Area of Science:

  • Materials Science
  • Crystallography
  • Mechanical Engineering

Background:

  • Deformation twinning is a critical mechanism governing crystal mechanical behavior.
  • The origins and detailed characteristics of deformation twinning remain poorly understood.
  • Controlling mechanical properties relies on understanding deformation mechanisms.

Purpose of the Study:

  • To investigate the influence of sample size on deformation twinning in titanium alloy single crystals.
  • To elucidate the transition in deformation mechanisms with decreasing sample size.
  • To develop a model explaining the observed size effects.

Main Methods:

  • In situ nano-compression experiments on titanium alloy single crystals.
  • Micro-compression testing with varying sample sizes.
  • Analysis of deformation mechanisms and flow stress evolution.

Main Results:

  • Deformation twinning stress increases significantly as sample size decreases to one micrometer.
  • Below one micrometer, deformation twinning is replaced by ordinary dislocation plasticity.
  • Flow stress saturates near ideal strength for submicrometer pillars, indicating a transition in plasticity.

Conclusions:

  • A 'stimulated slip' model is proposed to explain the size dependence of deformation twinning.
  • The findings reveal a critical sample size for the transition in deformation mechanisms.
  • Understanding this size effect is crucial for designing materials with tailored mechanical properties.