La2SrSc2O7: A‑Site Cation Disorder Induces Ferroelectricity in Ruddlesden–Popper Layered Perovskite Oxide

• Published in: Journal of the American Chemical Society Vol. 146; no. 7; pp. 4570 - 4581
• Main Authors: Yi, Wei, Kawasaki, Tatsushi, Zhang, Yang, Akamatsu, Hirofumi, Ota, Ryo, Torii, Shuki, Fujita, Koji
• Format: Journal Article
• Language: English
• Published: American Chemical Society 21.02.2024
• Subjects: ambient temperature; cations; hysteresis; neutron diffraction; phase transition; X-radiation

Rational design of ferroelectrics in layered perovskites, like n = 2 Ruddlesden–Popper (RP) phase A 3 B 2O7, has been achieved by the hybrid-improper ferroelectric (HIF) mechanism, in which an electric polarization is induced via a trilinear coupling to nonpolar BO6 octahedral rotation and tilt dist...