MATTER LogoIntroduction to Point Defects

Interstitials

This section concentrates on the interstitial sites in FCC, BCC and CPH crystal structures.

You will identify all the octahedral and tetrahedral interstices in the unit cell for each of the three structures. Additional questions will ask you to calculate the radius of each interstice as a proportion of the parent atom radius.

The section is completed by a comparison of the equilibrium concentrations of self-interstitials and vacancies.

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