(H2dabco)[(Na[(BF4)3]: an ABX3-type inorganic- organic hybrid perovskite compound exhibiting dielectric switching above room-temperature

摘要

The ABX3-type inorganic-organic hybrid perovskite (H2dabco)[(Na[(BF4)3] (H2dabco = 1,4-diazabicyclo[(2.2.2]octane cation, 1) undergoes a static-to-dynamic phase transition at 403/386 K (heating/cooling), respectively. Variable-temperature single crystal structure analysis reveals that the H2dabco cation and/or BF4 - bridging ligand undergo disordering. Dielectric measurements show a typical switchable dielectric transition between high- and low- dielectric states during the phase transition. Notably, the reversibility of dielectric switching properties of 1 was also identified. These excellent switching characteristics of 1 make it a type of switchable dielectric material.