In layered inorganic materials lattice distortions can couple to break inversion symmetry and drive improper ferroelectricity, but in perovskites, symmetry prohibits such an effect. Here, the authors use group-theoretical analysis to provide crystal engineering design principles for improper ferroelectricity in molecular perovskites.
- Hanna L. B. Boström
- Mark S. Senn
- Andrew L. Goodwin