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Reversible structural phase transitions and switchable dielectric behaviours in a cyanometallate-based double perovskite-type cage compound: [C3H4NS]2[KCo(CN)6]

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Abstract

A new cyanometallate-based double perovskite-type compound has been synthesized with the formula of (HTz)2[KCo(CN)6] (HTz = thiazolium cation, 1). The basic building units of the framework are Co(CN)6 and K ions. One K ion coordinates with six adjacent cyanide N atoms to form regular octahedral geometry. Meanwhile, the HTz rings exist in the cage. It undergoes two-step reversible structural phase transitions at 237 K and 210 K along with switchable dielectric transformation. Variable-temperature single-crystal structural analysis reveals that the relatively small displacements and/or thermal vibrations of the HTz rings cause the phase transitions. Meanwhile, the switchable dielectric constant of 1 means a dielectric transition between a low-dielectric state (switch off) and a high-dielectric state (switch on). This characteristic may enrich the family of stimuli-responsive materials and help find potential applications of switchable dielectric materials.

Graphical abstract: Reversible structural phase transitions and switchable dielectric behaviours in a cyanometallate-based double perovskite-type cage compound: [C3H4NS]2[KCo(CN)6]

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Article information


Submitted
28 Nov 2019
Accepted
14 Jan 2020
First published
15 Jan 2020

Mater. Chem. Front., 2020, Advance Article
Article type
Research Article

Reversible structural phase transitions and switchable dielectric behaviours in a cyanometallate-based double perovskite-type cage compound: [C3H4NS]2[KCo(CN)6]

Z. Gong, Q. Wang, J. Ma, J. Jiang, D. E, Z. Li, F. Qi and H. Liang, Mater. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QM00724E

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