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Illinois MATSE 280 Introduction to Engineering Materials, Lecture 5 - Part 1 : Imperfections in Solids

By Duane Douglas Johnson1, Omar N Sobh2

1. Iowa State University (formerly University of Illinois Urbana-Champaign) 2. University of Illinois at Urbana-Champaign

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Imperfections in Solids


  • What types of defects arise in solids? Describe them
  • Can the number and type of defects be varied and controlled?
  • How do defects affect material properties?
  • Are defects undesirable

Given masses or atomic weights of two or more elements in an alloy, calculate weight or atomic percentages.


  • Lattice Defects
  • Types of Imperfections
  • Length Scale of Imperfections
  • Point Defects
  • Point Defects in Ceramics
  • Frenkel and Schottky Defects: paired anions and cations
  • Ionic Crystals and Impurities: Interstitial, anion-substitutional, cation-substitutional
  • Equilibrium Concentration of Point Defects
  • Measuring Activation Energy
  • Estimating Vacancy Concentration
  • Observing Equil. Vacancy Concentration
  • Radiation damage creates numerous defects
  • Volumetric Defects from Radiation Damage
  • Alloying: atoms mixed on a lattice Solid Solutions and Ordered Compounds
  • Particles of New Phase in Solid-Solution Alloys
  • Hume-Rothery Rules for Alloys (atoms mixing on a lattice)
  • Hume-Rothery Rules for Mixing
  • Hume-Rothery Empirical Rules In Action
  • Alloying A Surface: Sn on Cu
  • Defining Composition of Alloy

Cite this work

Researchers should cite this work as follows:

  • Duane Douglas Johnson; Omar N Sobh (2008), "Illinois MATSE 280 Introduction to Engineering Materials, Lecture 5 - Part 1 : Imperfections in Solids,"

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