Issue 3, 2020

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

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]

Supplementary files

Article information

Article type
Research Article
Submitted
28 Nov 2019
Accepted
14 Jan 2020
First published
15 Jan 2020

Mater. Chem. Front., 2020,4, 918-923

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, 4, 918 DOI: 10.1039/C9QM00724E

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