In
this Lecture you would have learnt the following
Summary
In this lecture you have been introduced to lattices and unit cells. The fourteen Bravais lattices were characterized in terms of the unit cell parameters a, b, c,
,
and
(edge lengths and interplanar angles).
The symmetry properties of the unit cells and examples of various space filling lattice systems were given. The lattice energy of ionic crystals was calculated using the interionic forces by the introduction of the Madelung constant. The value of the Madelung constant is a characteristic of each lattice type and arises out of the summation of the Coulombic energies between the infinite sites of the lattice. The Born-Haber cycle was also described which gives an experimental method for determining the lattice energies using the first law of thermodynamics.
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,
and
(edge lengths and interplanar angles). 
