Extra problem
Let us study the concentration of Schottky defects in
a crystal as a function of temperature.
Study the problem first just by the use of the entropy, and than by the use of the Boltzmann factor.
What is a
Schottky defect?
-
one type of “defect” in a crystalline lattice which arises when an atom lives
the inside of the
lattice and diffuses on the surface of the material.
-
inside the lattice the total binding energy of the atom is bigger than on the
surface --> we have an
energy surplus associated with this defects.
-
One can choose the energy scale so that the total binding energy of the atoms
inside the crystal
is: 0. The binding energy of the atoms on the surface will
be than e.
U=0
U=e