TY - JOUR
T1 - Hierarchical dielectric orders in layered ferroelectrics Bi2SiO5
AU - Kim, Younghun
AU - Kim, Jungeun
AU - Fujiwara, Akihiko
AU - Taniguchi, Hiroki
AU - Kim, Sungwng
AU - Tanaka, Hiroshi
AU - Sugimoto, Kunihisa
AU - Kato, Kenichi
AU - Itoh, Mitsuru
AU - Hosono, Hideo
AU - Takata, Masaki
N1 - Publisher Copyright:
© © John C.H. Spence 2014.
PY - 2014/4/30
Y1 - 2014/4/30
N2 - Electric dipole engineering is now an emerging technology for high electron-mobility transistors, ferroelectric random access memory and multiferroic devices etc. Although various studies to provide insight into dipole moment behaviour, such as phase transition, order and disorder states, have been reported, macroscopic spontaneous polarization has been mainly discussed so far. Here, visualization of the electric dipole arrangement in layered ferroelectrics Bi2SiO5 by means of combined analysis of maximum entropy charge density and electrostatic potential distribution analysis based on synchrotron radiation X-ray powder diffraction data is reported. It was found that the hierarchical dipole orders, the weak-ferroelectric and ferroelectric configurations, were observed in the Bi2O2 and the SiO3 layers, respectively, and the ferrielectric configuration was realised by the interlayer interaction. This discovery provides a new method to visualize the local polarization in ferroelectric materials.
AB - Electric dipole engineering is now an emerging technology for high electron-mobility transistors, ferroelectric random access memory and multiferroic devices etc. Although various studies to provide insight into dipole moment behaviour, such as phase transition, order and disorder states, have been reported, macroscopic spontaneous polarization has been mainly discussed so far. Here, visualization of the electric dipole arrangement in layered ferroelectrics Bi2SiO5 by means of combined analysis of maximum entropy charge density and electrostatic potential distribution analysis based on synchrotron radiation X-ray powder diffraction data is reported. It was found that the hierarchical dipole orders, the weak-ferroelectric and ferroelectric configurations, were observed in the Bi2O2 and the SiO3 layers, respectively, and the ferrielectric configuration was realised by the interlayer interaction. This discovery provides a new method to visualize the local polarization in ferroelectric materials.
KW - electron charge density
KW - electrostatic potential
KW - hierarchical dielectric ordering
KW - visualization of local polarization
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U2 - 10.1107/S2052252514008008
DO - 10.1107/S2052252514008008
M3 - Article
AN - SCOPUS:84934272052
VL - 1
SP - 160
EP - 164
JO - IUCrJ
JF - IUCrJ
SN - 2052-2525
ER -