Phase diagram of a switchable dielectric framework near the critical point

Dr Anthony Phillips, Dr Nicholas Funnell, Miss Jiaxun Liu & Mr Zhengqiang Yang
The family of hybrid Prussian blue analogues includes many electroactive materials, where organic cations moving within the pores of the cyanide framework cause unusual and exploitable electrical properties. Our target material, (HIm)2K[Fe(CN)6], has a large dielectric constant in its two high-temperature phases due to the rotation of imidazolium ions in its cubic pores. The transition between these two phases affects the cation dynamics drastically, but itself depends on the unit cell parameter, varying from first-order...
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