4. Packing Defects Flashcards
Why do defects exist?
They end up lowering energy in weird ways.
What is entropy?
The chaoticity of the world.
Name the two types of point defects.
Vacancies
Substitution
Interstitial
What causes vacancies? How?
An increase in temperature! An atom breaks free.
How many atom sites will be empty just below melting point?
1 out of 10 000.
What are solid solutions?
An idea borrowed from liquids - when you have a solid “dissolved” in another solid. Another name for this is a substitutional atom
What is an interstitial atom?
An atom that has made its way into the interstices of a crystal lattice.
What are solid solutions?
“Solutions” in which the impurity atom is completely dissolved within the parent atoms
What’s the maximum allowable interstital concentration?
10%
