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Explore the fundamental properties and thermodynamic principles governing polymorphism in crystalline materials through this 33-minute lecture from NPTEL-NOC IITM. Examine lattice energies of different polymorphic forms and understand how these energy differences influence stability relationships between crystal structures. Learn to distinguish between enantiotropic polymorphs, which can reversibly transform at specific temperatures, and monotropic polymorphs, where one form is always more stable than another under normal conditions. Investigate solution-mediated phase transformations, where polymorphic changes occur through dissolution and recrystallization processes in solution environments. Gain insights into the thermodynamic factors that control polymorphic stability, transformation kinetics, and the practical implications of these phenomena in pharmaceutical, materials science, and chemical engineering applications.
