A review of the abnormal ferroelectric phenomenon in ferro-nanomaterials under ultrahigh-pressure: progress and mechanisms

Abstract

High-performance ferroelectric materials are pivotal to the operation of advanced technologies in sensing, data storage, and beyond. A variety of conventional approaches with thermal annealing and chemical doping have been extensively adopted in order to further improve the ferroelectric properties. An ingenious method involves external pressure followed by structural deformation to regulate ferroelectric behavior. This review summarizes pressure-induced modulation of ferroelectric behavior and highlights the structure transformations and ultimate characteristics. The relevant polarization, Curie temperature, and phase transitions are discussed based on their crystal structure changes in different systems under various ultrahigh-pressure conditions such as uniaxial stress, hydrostatic pressure, and supercritical CO₂ isostatic pressure. In particular, the challenges and opportunities in developing ferroelectric materials under ultrahigh-pressure are provided as future research directions.