Studying the motion of TEA cations in the dielectric material TEA(TCNQ)2 using quasi-elastic neutron scattering
We wish to perform a detailed study of the elastic incoherent structure factor for the organic magneto-electric material triethylammonium bis-7,7,8,8-tetracyanoquinodimethane (TEA(TCNQ)2). This material shows some very interesting behaviour within the capacitance and dielectric loss, where anomalies occur at two temperatures; 220 and 120 K. The lower temperature is related to the freezing out of magnetic fluctuations as the sample enters an ordered magnetic state. The high temperature transition is related to the freezing of the TEA cation, where above 220 K, the TEA cation is randomly fluctuating. Below 220 K the TEA cations freeze into a static state, accompanied by a large dielectric anomaly, but there is relatively little information regarding this. We want to perform QENS measurements to pin down the behaviour of the TEA cation to answer questions on how the cations jump and re-orientate themselves.
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BERLIE Adam; NATALI Francesca; SZABLEWSKI Marek; Mark T F Telling; TERRY Ian and ZELLER Dominik. (2019). Studying the motion of TEA cations in the dielectric material TEA(TCNQ)2 using quasi-elastic neutron scattering. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-02-184
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