Bond Strength
For a solid crystalline ionic compound the enthalpy change in forming the solid from gaseous ions is termed the lattice energy. The experimental value for the lattice energy can be determined using the Born-Haber cycle. It can also be calculated using the Born-Landé equation as the sum of the electrostatic potential energy, calculated by summing interactions between cations and anions, and a short range repulsive potential energy term. The electrostatic potential can be expressed in terms of the inter-ionic separation and a constant (Madelung constant) that takes account of the geometry of the crystal. The Born-Landé equation gives a reasonable fit to the lattice energy of e.g. sodium chloride where the calculated value is −756 kJ/mol which compares to −787 kJ/mol using the Born-Haber cycle.
Read more about this topic: Ionic Bond
Famous quotes containing the words bond and/or strength:
“Wedding is great Juno’s crown,
O blessed bond of board and bed!
‘Tis Hymen peoples every town,
High wedlock then be honorèd.
Honor, high honor, and renown
To Hymen, god of every town!”
—William Shakespeare (1564–1616)
“Our poetry emulates the recent progress in military strategy: Our army’s strength is the foot soldiers.”
—Franz Grillparzer (1791–1872)