151. Ultralarge Dielectric Relaxation and Self-Recovery Triggered by Hydrogen-Bonded Polar Components.
- Author
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Hong DL, Luo YH, He XT, Wang C, Wang JY, Chen FH, Wu HS, Chen C, and Sun BW
- Abstract
Subtle integration of rotatable polar components into dielectric crystals can contribute significantly to adjustable switching temperatures ( T
s ) and dielectric relaxation behaviors. Currently, one of the biggest challenges lies in the design of optimal polar components with moderate motion resistance in a crystalline system. In this work, we demonstrate that under refrigerator conditions, rotatable hydrogen-bonded one-dimensional (1D) cationic chains, {[C2 H6 N5 ]+ }n (C2 H6 N5 = 3,5-diamino-1,2,4-triazolinium), and two-dimensional (2D) anionic layers, {[(H2 O)2 ·SO4 ]2- }n , can be generated in an organic salt, 3 ([C2 H6 N5 ]2 ·[(H2 O)2 ·SO4 ]). Compared with the nonhydrated precursor, 2 ([C2 H7 N5 ]·[SO4 ]), the rotation of these 1D and 2D ionic species triggers a reversible phase transition and dielectric switching in 3. In addition, the significantly sluggish rotation of the 1D cationic chains from parallel to unparallel stacking and the counter-clockwise rotation of the 2D anionic layers, compared with their reverse processes, induce a frequency-dependent dielectric response with a more highly adjustable heating Ts ↑ than the cooling Ts ↓. More importantly, 3 possesses excellent self-recovery ability attributed to the highly dynamic character of the hydrogen-bonded ionic species. The strategy here can provide a fairly good model for designing dielectric crystals with desired rotatable polar components.- Published
- 2019
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