Lattice structure of metals

This article provides answers to the following questions, among others:

  • Why do metals have a regular structure?
  • What is meant by a crystal?
  • How does the atomic structure of an amorphous solid look like?
  • Which statement does the lattice constant provide?
  • What is the order of magnitude of the lattice constant of metals?
  • How many atoms are contained in an iron cube of 25 mm edge length?
  • What is a unit cell?
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Important types of lattice structures

This article provides answers to the following questions, among others:

  • How is a body-centered cubic lattice structured?
  • What is meant by the coordination number?
  • Which statement provides the packing density?
  • How does the hexagonal closest packed grid build up?
  • What is meant by a stacking sequence?
  • How does the face-centered cubic unit cell come about?
  • Why does the hcp-lattice and the fcc-lattice have a maximum packing density?
  • Why can one write with a pencil?
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Derivation of the packing density

This article provides answers to the following questions, among others:

  • What is meant by the packing density (or packing factor)?
  • How is the packing density calculated for the body-centered cubic lattice (bcc)?
  • How is the packing density calculated in the face-centered cubic lattice (fcc)?
  • Why is the packing density for the hexagonal closest packed lattice identical to the fcc-lattice?
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Crystallographic defects

This article provides answers to the following questions, among others:

  • Which types of crystallographic defects can be distinguished?
  • What are vacancy defects?
  • What are the differences between substitutional atoms and interstitial atoms with regard to their inclusion in the metal?
  • What are dislocations?
  • What distinguishes a grain in a metal?
  • What is the difference between a high angle and a low angle grain boundary?
  • What is the difference between a coherent, partially coherent and incoherent phase boundary?
  • What is a stacking fault?
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