TY - JOUR
T1 - Strongly Enhanced Polarization in a Ferroelectric Crystal by Conduction-Proton Flow
AU - Yanagisawa, Junichi
AU - Aoyama, Takuya
AU - Fujii, Kotaro
AU - Yashima, Masatomo
AU - Inaguma, Yoshiyuki
AU - Kuwabara, Akihide
AU - Shitara, Kazuki
AU - Le Ouay, Benjamin
AU - Hayami, Shinya
AU - Ohba, Masaaki
AU - Ohtani, Ryo
N1 - Publisher Copyright:
© 2024 American Chemical Society
PY - 2024/1/17
Y1 - 2024/1/17
N2 - Ion conductors comprising noncentrosymmetric frameworks have emerged as new functional materials. However, strongly correlated polarity functionality and ion transport have not been achieved. Herein, we report a ferroelectric proton conductor, K2MnN(CN)4·H2O (1·H2O), exhibiting the strong correlation between its polar skeleton and conductive ions that generate anomalous ferroelectricity via the proton-bias phenomenon. The application of an electric field of ±1 kV/cm (0.1 Hz) on 1·H2O at 298 K produced the ferroelectricity (polarization = 1.5 × 104 μC/cm2), which was enhanced by the ferroelectric-skeleton-trapped conductive protons. Furthermore, the strong polarity-proton transport coupling of 1·H2O induced a proton-rectification-like directional ion-conductive behavior that could be adjusted by the magnitude and direction of DC electric fields. Moreover, 1·H2O exhibited reversible polarity switching between the polar 1·H2O and its dehydrated form, 1, with a centrosymmetric structure comprising an order-disorder-type transition of the nitrido-bridged chains.
AB - Ion conductors comprising noncentrosymmetric frameworks have emerged as new functional materials. However, strongly correlated polarity functionality and ion transport have not been achieved. Herein, we report a ferroelectric proton conductor, K2MnN(CN)4·H2O (1·H2O), exhibiting the strong correlation between its polar skeleton and conductive ions that generate anomalous ferroelectricity via the proton-bias phenomenon. The application of an electric field of ±1 kV/cm (0.1 Hz) on 1·H2O at 298 K produced the ferroelectricity (polarization = 1.5 × 104 μC/cm2), which was enhanced by the ferroelectric-skeleton-trapped conductive protons. Furthermore, the strong polarity-proton transport coupling of 1·H2O induced a proton-rectification-like directional ion-conductive behavior that could be adjusted by the magnitude and direction of DC electric fields. Moreover, 1·H2O exhibited reversible polarity switching between the polar 1·H2O and its dehydrated form, 1, with a centrosymmetric structure comprising an order-disorder-type transition of the nitrido-bridged chains.
UR - http://www.scopus.com/inward/record.url?scp=85181566335&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85181566335&partnerID=8YFLogxK
U2 - 10.1021/jacs.3c10841
DO - 10.1021/jacs.3c10841
M3 - Article
C2 - 38166110
AN - SCOPUS:85181566335
SN - 0002-7863
VL - 146
SP - 1476
EP - 1483
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 2
ER -