Materials Science: Imperfections in Solids
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Questions and Answers

What are the two essential conditions for an atom to make a move during diffusion?

  • Presence of lattice distortion and vacancy
  • Presence of interstitial position and lattice vibration
  • Presence of empty adjacent site and sufficient energy (correct)
  • Presence of impurity atoms and high temperature
  • What is the name of the mechanism that involves the interchange of an atom from a normal lattice position to an adjacent vacant lattice site?

  • Interstitial diffusion
  • Self-diffusion
  • Vacancy diffusion (correct)
  • Impurity diffusion
  • What is the prerequisite for vacancy diffusion to occur?

  • Presence of impurity atoms
  • Presence of lattice distortion
  • Presence of vacancies (correct)
  • Presence of interstitial positions
  • What happens to the diffusing atoms and vacancies during vacancy diffusion?

    <p>They exchange positions</p> Signup and view all the answers

    What type of diffusion involves atoms migrating from an interstitial position to a neighboring empty one?

    <p>Interstitial diffusion</p> Signup and view all the answers

    What is a necessary condition for significant concentrations of vacancies to exist in metals?

    <p>Elevated temperatures</p> Signup and view all the answers

    Which type of diffusion occurs when impurity atoms substitute for host atoms?

    <p>Interdiffusion</p> Signup and view all the answers

    What is the direction of motion of vacancies during vacancy diffusion?

    <p>Opposite direction of the diffusing atoms</p> Signup and view all the answers

    What is the name of the process that involves the movement of atoms in a lattice?

    <p>Diffusion</p> Signup and view all the answers

    What is the result of the interaction between diffusing atoms and vacancies during vacancy diffusion?

    <p>Exchange of positions</p> Signup and view all the answers

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