Crossover between Tilt Families and Zero Area Thermal Expansion in Hybrid Prussian Blue Analogues.

Materials in the family of Prussian blue analogues (C3H5N2)2K[ M(CN)6], where C3H5N2 is the imidazolium ion and M=Fe, Co, undergo two phase transitions with temperature; at low temperatures the imidazolium cations have an ordered configuration ( C2/ c), while in the intermediate- and high-temperature phases (both previously reported as [ABSTRACT FROM AUTHOR]