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Issue 33, 2017
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Inorganic–organic hybrid switchable dielectric materials with the coexistence of magnetic anomalies induced by reversible high-temperature phase transition

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Abstract

An inorganic–organic hybrid compound that features a zero-dimensional inorganic structural framework, N-methylpiperidinium tetrabromoferrate(III) (compound 1, [C6H14N][FeBr4]), has been reported as a new switchable dielectric material with the coexistence of weak magnetic anomalies. It is noteworthy that 1 demonstrates remarkable dielectric responses, which can be tuned between two distinct dielectric states and reversibly switched by phase transition at ∼340 K (Tc). Its high-dielectric constants are at least 4 times as large as that of the low-dielectric state. Structural analysis reveals that 1 belongs to the monoclinic crystal system with the space group P21/c at room temperature, but transforms into an orthorhombic system with the space group Cmcm above Tc. The disordering of organic cations affords a driving force for high-temperature phase transition in 1 along with its switchable dielectric activities. Besides, weak magnetic anomalies were also found in 1 at the vicinity of its Tc, which should be reminiscent of another possible physical channel to the phase transition. This finding suggests that 1 might be a potential multifunctional material with the coexistence of switchable dielectric bistability and magnetic responses, which opens up new possibilities to develop molecular functional materials.

Graphical abstract: Inorganic–organic hybrid switchable dielectric materials with the coexistence of magnetic anomalies induced by reversible high-temperature phase transition

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Publication details

The article was received on 14 Mar 2017, accepted on 20 Jul 2017 and first published on 20 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC01085K
Citation: J. Mater. Chem. C, 2017,5, 8509-8515
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    Inorganic–organic hybrid switchable dielectric materials with the coexistence of magnetic anomalies induced by reversible high-temperature phase transition

    S. Han, J. Zhang, B. Teng, C. Ji, W. Zhang, Z. Sun and J. Luo, J. Mater. Chem. C, 2017, 5, 8509
    DOI: 10.1039/C7TC01085K

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