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A study of the dynamics and structure of the dielectric anomaly within the molecular solid TEA(TCNQ)2

Berlie, Adam; Terry, Ian; Szablewski, Marek; Telling, Mark; Apperley, David; Hodgkinson, Paul; Zeller, Dominik

A study of the dynamics and structure of the dielectric anomaly within the molecular solid TEA(TCNQ)2 Thumbnail


Authors

Adam Berlie

Mark Telling

David Apperley

Dominik Zeller



Abstract

With rising interest in organic-based functional materials, it is important to understand the nature of magnetic and electrical transitions within these types of systems. One intriguing material is triethylammonium bis-7,7,8,8-tetracyanoquinodimethane (TEA(TCNQ)2) where there is an order–disorder transition at ∼220 K. This work focuses on novel neutron scattering techniques to understand the motion of the TEA cations at this transition and explain why we see the dielectric behaviour and possible ferroelectricity within this type of system. We show that the motion of the methyl groups of the TEA cation is spatially restricted below 220 K, whereas above the dielectric anomaly at 220 K, they are free to re-orientate, which ultimately leads to some rich behaviour that could be further exploited. Lastly, we also study the dynamics at this transition using a variety of additional techniques, helping to provide a consistent picture of the motions of the cations.

Citation

Berlie, A., Terry, I., Szablewski, M., Telling, M., Apperley, D., Hodgkinson, P., & Zeller, D. (2022). A study of the dynamics and structure of the dielectric anomaly within the molecular solid TEA(TCNQ)2. Physical Chemistry Chemical Physics, 24(12), 7481-7492. https://doi.org/10.1039/d2cp00142j

Journal Article Type Article
Acceptance Date Feb 24, 2022
Online Publication Date Mar 1, 2022
Publication Date Mar 28, 2022
Deposit Date Mar 30, 2022
Publicly Available Date Mar 1, 2023
Journal Physical Chemistry Chemical Physics
Print ISSN 1463-9076
Electronic ISSN 1463-9084
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 24
Issue 12
Pages 7481-7492
DOI https://doi.org/10.1039/d2cp00142j

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