ja7b13688_si_002.cif (152.98 kB)
Field-Induced Antipolar–Polar Structural Transformation and Giant Electrostriction in Organic Crystal
dataset
posted on 2018-03-05, 00:00 authored by Kensuke Kobayashi, Sachio Horiuchi, Shoji Ishibashi, Youichi Murakami, Reiji KumaiThe field-induced antipolar–polar
structural transition
in an organic antiferroelectric 2-trifluoromethylnaphthimidazole crystal
is investigated by performing synchrotron X-ray diffraction. The polarities
of all of the hydrogen-bonded chains become parallel with each other
in the presence of an external electric field. The switching is accompanied
by a giant electrostriction, which provides 1 order of magnitude larger
strain than the piezoelectric strain of the organic ferroelectrics:
croconic acid and poly(vinylidene fluoride); however, it is comparable
to those of typical commercial piezoelectric ceramics. The crystal
structure analysis with electric field shows that the origin of the
observed giant electrostriction can be attributed to the shear strain
that emerges from the polarity switching of the hydrogen-bonded chains.
The antipolar–polar structural transition in antiferroelectrics
could be employed for the development of high-performance electrostrictive
organic materials.