Point Defects in Crystalline Solids

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What is a vacancy in a crystal lattice?

An empty site where an atom is missing

In what type of solid solution do solute atoms replace the host atoms?

Substitutional

What factor determines whether a solute dissolves in a solvent in a substitutional solid solution?

Electronegativity difference

What increases the equilibrium number of vacancies in a material?

<p>Increasing temperature</p> Signup and view all the answers

According to the Hume-Rothery rules, what must be the atomic size difference for appreciable solid solubility in a substitutional solid solution?

<p>-15%</p> Signup and view all the answers

What type of dislocation is formed by an extra portion of a plane of atoms within the crystal?

<p>Edge dislocation</p> Signup and view all the answers

In which type of dislocation are the magnitude and direction of the lattice distortion expressed in terms of a Burgers vector?

<p>Screw dislocation</p> Signup and view all the answers

What is the characteristic visual appearance of a dislocation under a microscope?

<p>Dark lines</p> Signup and view all the answers

What type of stress is thought to form a screw dislocation?

<p>Shear stress</p> Signup and view all the answers

What term is used to describe dislocations that exhibit components of both edge and screw types?

<p>Mixed dislocations</p> Signup and view all the answers

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