A unit cell is the smallest portion of a crystal lattice.
A cubic unit cell has 8 corners, 6 faces, and 1 center. An atom placed in each point occupies a certain fraction of the volume of the cube:
• Corner → 1/8 of the atom is inside the cubic unit cell
• Face → ½ of the atom is inside the cubic unit cell
• Center → 1 whole of the atom is inside the cubic unit cell
There are different types of unit cells. The most common are:
The unit cell of a compound containing potassium, aluminum, and fluorine is shown here.
What type of lattice does this crystal possess (all three lattice vectors are mutually perpendicular)?
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