Lattice energy

The lattice energy indicates how much work you have to spend to infinity to remove the atomic, ionic or molecular components of a solid in a vacuum far apart. The lattice energy is a binding energy. Conversely, her negative is the potential energy when the atoms, molecules or ions from an infinite distance (gas state) come together to form a crystal lattice, ie, the sum of the lattice energy is released in the form of a grid. The lattice energy of ionic compounds ( such as sodium salt), metals (such as iron) and covalently linked polymers ( such as diamond ) are considerably larger because of the strong primarily electrostatic or covalent interactions, as in solids which are formed from neutral molecules ( such as sugars or iodine) and only interact via dipole -dipole and van der Waals forces.

To calculate the lattice energy for ionic compounds see also: Madelung constant, Born- Landé equation, Kapustinskii equation

For enthalpy calculations at solving the crystal lattice see lattice enthalpy.

The lattice energy and lattice energy are qualitatively different. The lattice energy is an internal energy, while the lattice enthalpy is an enthalpy. Thus, the lattice enthalpy taken into account in addition the exact amount of volume work against a constant external pressure. If one has determined for the divergence Bring the ingredients of the solid molar lattice enthalpy, as is the molar lattice energy. This is based on the amount of change in volume.