Diffusion in Solids: Key Concepts
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Questions and Answers

What is diffusion?

  • The random movement of atoms within an essentially pure material
  • The diffusion of small atoms from one interstitial position to another in the crystal structure
  • The movement of atoms from high to low concentration (correct)
  • The movement of atoms from low to high concentration

    • Which mechanism of diffusion involves the diffusion of small atoms from one interstitial position to another in the crystal structure?

  • Vacancy diffusion
  • Self-diffusion
  • External diffusion
  • Interstitial diffusion (correct)

    • In what type of material does self-diffusion occur?

  • Alloy
  • Elemental solid (correct)
  • Compound material
  • Polymer

    • What is a solid solution?

    <p>A homogeneous composition throughout a material resulting from the addition of impurity atoms</p> Signup and view all the answers

    What is vacancy diffusion?

    <p>The diffusion of atoms when an atom leaves a regular lattice position to fill a vacancy in the crystal</p> Signup and view all the answers

    What is the consequence of the constant thermal motion of atoms, molecules, and particles?

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

    Which type of diffusion involves the migration of atoms within an elemental solid?

    <p>Self-diffusion</p> Signup and view all the answers

    What is the term for the addition of impurity atoms to a metal resulting in the formation of a homogenous composition throughout?

    <p>Solid solution</p> Signup and view all the answers

    Which law describes steady-state diffusion in materials?

    <p>Fick's First Law</p> Signup and view all the answers

    In which mechanism for diffusion does an atom leave a regular lattice position to fill a vacancy in the crystal?

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

    Which type of diffusion involves the migration of small atoms from one interstitial position to another in the crystal structure?

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

    What is the term for mass transport by atomic motion as a consequence of the constant thermal motion of atoms, molecules, and particles?

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

    In which mechanism for diffusion does an atom leave a regular lattice position to fill a vacancy in the crystal?

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

    What is the term for the addition of impurity atoms to a metal resulting in the formation of a homogenous composition throughout?

    <p>Solid solution</p> Signup and view all the answers

    Which law describes non-steady-state diffusion and is represented by Fick’s Second Law?

    <p>Fick’s Second Law</p> Signup and view all the answers

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