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H/F substituted perovskite compounds with above-room-temperature ferroelasticity: [(CH₃)₄P][Cd(SCN)₃] and [(CH₃)₃PCH₂F][Cd(SCN)₃]
- Cao, Ying-Jie, Zhou, Lin, Shi, Ping-Ping, Ye, Qiong, Fu, Da-Wei
- Chemical communications 2019 v.55 no.58 pp. 8418-8421
- ambient temperature, cadmium, chemical reactions, crystal structure, dielectric properties, phase transition, van der Waals forces
- An organic–inorganic perovskite compound [(CH₃)₄P][Cd(SCN)₃] (1) and its fluorine-substituted product [(CH₃)₃PCH₂F][Cd(SCN)₃] (2) exhibit ferroelastic phase transitions above room temperature. The very close van der Waals radii of H and F atoms ensure isomorphism of the crystal structures. However, the higher phase transition temperature, stronger ferroelastic spontaneous strain value and dielectric properties of 2 can possibly be explained by differences in the electronegativity between F and H atoms.