Multiaxial Molecular Ferroelectrics with a Large Viable Temperature Range

Molecular ferroelectrics, due to their structural diversity, tunability,and ease of handling, have received widespread attention, which are viablealternatives or supplements to traditional ceramic ferroelectrics, and are expectedto solve increasingly serious energy and environmental problems. However, lowTclimits the application of molecular ferroelectrics. We break the highly symmetricalstructure of the spherical molecule dabco, introducingn-butyl groups andcombining modified cations with several cobalt halides. The resulting compound[n-Budabco]CoBr3(n-Budabco =N-n-butyl-N '-diazabicyclo[2,2,2]octane) crystal-lized in a polar point group (mm2), and no phase transition behavior was obtainedbefore decomposing (603 K). The ferroelectricity was adequately verified byP-Ehysteresis loop and ferroelectric domain observation. To the best of ourknowledge, such a wide viable temperature range is unprecedented among thereported molecular ferroelectrics. This work will not only enrich high-temperatureferroelectrics but also inspire more creative optimization strategies of ferroelectricity.