Superelastic Organic Crystals

Superelastic materials (crystal‐to‐crystal transformation pseudo elasticity) that consist of organic components have not been observed since superelasticity was discovered in a Au‐Cd alloy in 1932. Superelastic materials have been exclusively developed in metallic or inorganic covalent solids, as represented by Ti‐Ni alloys. Organosuperelasticity is now revealed in a pure organic crystal of terephthalamide, which precisely produces a large motion with high repetition and high energy storage efficiency. This process is driven by a small shear stress owing to the low density of strain energy related to the low lattice energy. A pure organic crystal of terephthalamide exhibits superelasticity (crystal‐to‐crystal transformation pseudo elasticity). A large motion is produced precisely with high repetition and high energy storage efficiency. This process is driven by a small shear stress owing to the low density of strain energy, which is related to the low lattice energy.