Point Defects in Crystalline Solids
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Questions and Answers

What is a vacancy in a crystal lattice?

  • An atom with a different crystal structure
  • An atom that replaces another atom in the lattice
  • An atom that takes up an interstitial site
  • An empty site where an atom is missing (correct)
  • In what type of solid solution do solute atoms replace the host atoms?

  • Interstitial
  • Alloy
  • Compound
  • Substitutional (correct)
  • What factor determines whether a solute dissolves in a solvent in a substitutional solid solution?

  • Atomic mass difference
  • Crystal structure similarity
  • Electronegativity difference (correct)
  • Valence number
  • 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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