Solvent-assisted mechanochemical crystallization of the metal-free perovskite solid solution (H2dabco, H2hmta)NH4(BF4)3

Abstract

All-proportional solid solutions of the metal-free perovskite (H₂dabco_1−y, H₂hmta_y)(NH₄)(BF₄)₃ ((d,h)-BF₄) were crystallized via a mechanochemical method. Their molecular dynamics depend on the ratio y with a compositional boundary at y = 0.43, where H₂dabco²⁺ was deduced to be at a dynamic disorder state, even below phase transition temperature to a plastic crystalline phase seen at y = 0.