Statics and dynamics of ferroelectric domains in molecular multiaxial ferroelectric (Me3NOH)(2)[KCo(CN)(6)]
authors Xu, WJ; Romanyuk, K; Zeng, Y; Ushakov, A; Shur, V; Tselev, A; Zhang, WX; Chen, XM; Kholkin, A; Rocha, J
nationality International
journal JOURNAL OF MATERIALS CHEMISTRY C
keywords ROOM-TEMPERATURE FERROELECTRICITY; ORGANIC-INORGANIC HYBRID; THERMAL-EXPANSION; PEROVSKITE-LIKE; SOLID-SOLUTION; CRYSTALS; PIEZOELECTRICITY; POLARIZATION; SERIES
abstract The recent emergence of multiaxial molecular ferroelectrics opens up a new route toward technological evolution in the next-generation flexible/wearable device applications. However, a fundamental understanding of multiaxial ferroelectricity and polarization switching at the microscopic level in these materials is still missing. Herein, we study a high-temperature multiaxial perovskite ferroelectric (Me3NOH)(2)[KCo(CN)(6)] (TMC-4) that exhibits a bond-switching phase transition at 417 K with notable piezoelectricity and spontaneous polarization in the ferroelectric phase. The cleavage and reformation of coordination bonds and hydrogen bonds during the bond-switching transition all contribute to a large entropy change of 178.79 J K-1 kg(-1) at the phase transition. Using piezoresponse force microscopy (PFM), we observed diverse ferroelectric domain structures and provide evidence for both 180 degrees and non-180 degrees domain switching and their possible effect on the functional properties of molecular ferroelectrics. The results provide an insight into the multiaxial ferroelectricity of TMC-4 at the microscopic level enabling its further use in device applications.
publisher ROYAL SOC CHEMISTRY
issn 2050-7526
isbn 2050-7534
year published 2021
volume 9
issue 33
beginning page 10741
ending page 10748
digital object identifier (doi) 10.1039/d1tc01261d
web of science category 8
subject category Materials Science, Multidisciplinary; Physics, Applied
unique article identifier WOS:000649428500001

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