Abstract

A hydrogen-bonded metallocyanide-based (AZE)2(H3O)[Co(CN)6] framework was obtained by introducing a hydronium cation to the A2B(1)B(2)CN6-type structure. Simple K+/H3O+ substitution exchange the three-dimensional structure of the double-perovskite into two-dimensional layers containing open inorganic cages with a strongly discontinuous improper ferroelastic phase transition.

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