Magnetoelectric coupling springing up in molecular ferroelectric: ▫${\rm [N(C_2H_5)_3CH_3][FeCl_4]}$▫
Burazer, Sanja ...
A molecule-based ferroelectric triethylmethylammonium tetrachloroferrate(III) (▫${\rm [N(C_2H_5)_3CH_3][FeCl_4]}$▫) powder was designed as a multifunctional material exhibiting excellent multiple ...bistability. Prepared by the slow evaporation method at room temperature, the compound crystallizes in the non-centrosymmetric assembly of hexagonal symmetry (▫$P6_3/mc$▫ space group) which undergoes a reversible temperature-triggered phase transition pinpointed at 363 K to the centrosymmetric packing within the ▫$P6_3/mc$▫ space group. Aside from the inseparable role of the symmetry-breaking process smoothly unveiled from the X-ray powder diffraction data, a striking change in the dielectric permittivity observed during the paraelectric-to-ferroelectric phase transition directly discloses the bistable dielectric behavior-an exceptionally high increase in the dielectric permittivity of about 360% at 100 kHz across the heating and cooling cycles is direct proof showing the highly desirable stimuli-responsive electric ordering in this improper ferroelectric architecture. Due to the magnetically modulated physical properties resulting in the coupling of magnetic and electric orderings, the flexible assembly of ▫${\rm [N(C_2H_5)_3CH_3][FeCl_4]}$▫ could be used to boost the design and development of novel magnetoelectric devices.
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