(H2dabco)[Na(BF4)3]: an ABX3-type inorganic-organic hybrid perovskite compound with dielectric switching above room-temperature
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 BF4ˉ bridging ligand undergo disordering. Dielectric measurement shows a typical switchable dielectric transition between high- and low- dielectric state during the phase transition. Notably, reversibility of dielectric switching property of 1 was also identified. These excellent switching characteristics of 1, making it a type of switchable dielectric material.