Real-space visualization of order-disorder transition in BaTiO₃.

ABSTRACT: Ferroelectricity in BaTiO₃ was observed nearly 80 years ago, but the mechanism underlying its ferroelectric-paraelectric phase transition remains elusive. The order-disorder transition has been recognized as playing a critical role; however, the precise nature of the order parameter still remains under scrutiny, including the local dipole direction and the correlations above and below the Curie temperature. Using in situ scanning transmission electron microscopy, we directly map polar displacements in BaTiO₃ across the ferroelectric-paraelectric phase transition, providing atomistic insights into an order-disorder mechanism. Atomic tracking reveals finite polar Ti displacements in the paraelectric phase where they manifest as random polar nanoregions. The displacement

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC12407081 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature