Colossal Strain Tuning of Ferroelectric Transitions in KNbO₃ Thin Films.

ABSTRACT: Strong coupling between polarization (P) and strain (ɛ) in ferroelectric complex oxides offers unique opportunities to dramatically tune their properties. Here colossal strain tuning of ferroelectricity in epitaxial KNbO₃ thin films grown by sub-oxide molecular beam epitaxy is demonstrated. While bulk KNbO₃ exhibits three ferroelectric transitions and a Curie temperature (T_c) of ≈676 K, phase-field modeling predicts that a biaxial strain of as little as -0.6% pushes its T_c > 975 K, its decomposition temperature in air, and for -1.4% strain, to T_c > 1325 K, its melting point. Furthermore, a strain of -1.5% can stabilize a single phase throughout the entire temperature range of its stability. A combination of temperature-dependent second

SUBMITTER: Hazra S 

PROVIDER: S-EPMC11681320 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature