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Phase transition in the extreme: a cubic-to-triclinic symmetry change in dielectrically switchable cyanide perovskites

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Abstract

Two novel three-dimensional metal–organic compounds of formula FA2KM(CN)6, where M = Co, Fe and FA = formamidinium (CH(NH2)2+), have been found to crystallize in a perovskite-like architecture. They have been investigated by X-ray diffraction, dielectric and spectroscopic methods as a function of temperature in order to determine the interactions in the crystals and the mechanism of phase transitions occurring at ca. 321 K upon heating. The phase transitions in both crystals are of first order and originate from the ordering of the formamidinium cations below TC. Symmetry reduction (cubic-to-triclinic) seems to be the strongest upon temperature decrease among known metal–organic frameworks. These materials have been proposed as possible switchable dielectrics with a convenient near-room-temperature transition temperature.

Graphical abstract: Phase transition in the extreme: a cubic-to-triclinic symmetry change in dielectrically switchable cyanide perovskites

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Publication details

The article was received on 09 Aug 2019, accepted on 14 Sep 2019 and first published on 16 Sep 2019


Article type: Paper
DOI: 10.1039/C9DT03250A
Dalton Trans., 2019, Advance Article

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    Phase transition in the extreme: a cubic-to-triclinic symmetry change in dielectrically switchable cyanide perovskites

    M. Trzebiatowska, A. Gągor, L. Macalik, P. Peksa and A. Sieradzki, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C9DT03250A

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