Phase Transition Energy of the Short Period Basic Polytypes of CdI2

The CdI₂ material grown under similar thermodynamic conditions exhibits several polytypes (phases). Out of these the basic phases are thermodynamically independent and grow with their minimum free (potential) energy. In the present paper we have calculated the Madelung constants cohesive (potential) and the phase transformation energy for the basic phases viz. 2H → 4 H.