Issue 40, 2022

Structural phase transition and dielectric relaxation in an organic–inorganic hybrid compound: [(CH3)3NH]4[Fe(SCN)6]Cl

Abstract

Phase transition materials that can exist in two energetically stable states are suitable for a range of applications in electronics and physics. In this work, we report a new organic–inorganic hybrid compound, [(CH3)3NH]4[Fe(SCN)6]Cl, which undergoes a structural phase transition at about 195 K accompanied with the thermal hysteresis of dielectric bistability as well as anisotropic dielectric relaxation along the crystallographic a-, b-, and c-axis in a broad temperature range, which may be considered as a potential relaxor-type dielectric material. The analyses of the dynamic structures revealed that the structural phase transition was induced by the synergetic effect of orientation of the (CH3)3NH+ cations, displacement of the Cl anions, and slight tilling of the [Fe(SCN)6]3− complex ions. Among these, the slowly progressive reorientation of the (CH3)3NH+ cations are mainly responsible for the prominent dielectric relaxation behavior. Further studies on dielectric relaxation disclose a rather narrow distribution of the relaxation time and practically a mono-dispersive type dielectric relaxation process, which may be considered as a Debye model.

Graphical abstract: Structural phase transition and dielectric relaxation in an organic–inorganic hybrid compound: [(CH3)3NH]4[Fe(SCN)6]Cl

Supplementary files

Article information

Article type
Paper
Submitted
21 Aug 2022
Accepted
15 Sep 2022
First published
15 Sep 2022

CrystEngComm, 2022,24, 7083-7088

Structural phase transition and dielectric relaxation in an organic–inorganic hybrid compound: [(CH3)3NH]4[Fe(SCN)6]Cl

P. Wang, M. Chen, Y. Tong, S. Yin and B. Huang, CrystEngComm, 2022, 24, 7083 DOI: 10.1039/D2CE01150F

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