Incorporation of lattice potential energy, UPOT, within a Born–Fajans–Haber thermochemical cycle based on enthalpy changes necessitates correction of the energy of the lattice to an enthalpy term, ΔHL. For a lattice containing si ions of type i in the formula unit, the lattice enthalpy is given by
ΔHL = UPOT + ∑si[(ci/2) - 2]RT
where R is the gas constant (= 8.314 J K-1 mol-1), T is the absolute temperature, and ci is defined according as to whether the ion i is monatomic (ci = 3), linear polyatomic (ci= 5), or polyatomic (ci= 6), respectively.
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