TY - JOUR
T1 - Ferroelectric mesocrystals of bismuth sodium titanate
T2 - Formation mechanism, nanostructure, and application to piezoelectric materials
AU - Hu, Dengwei
AU - Kong, Xingang
AU - Mori, Kotaro
AU - Tanaka, Yasuhiro
AU - Shinagawa, Kazunari
AU - Feng, Qi
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013/9/16
Y1 - 2013/9/16
N2 - Ferroelectric mesocrystals of Bi0.5Na0.5TiO 3 (BNT) with [100]-crystal-axis orientation were successfully prepared using a topotactic structural transformation process from a layered titanate H1.07Ti1.73O4·nH2O (HTO). The formation reactions of BNT mesocrystals in HTO-Bi2O 3-Na2CO3 and HTO-TiO2-Bi 2O3-Na2CO3 reaction systems and their nanostructures were studied by XRD, FE-SEM, TEM, SAED, and EDS, and the reaction mechanisms were given. The BNT mesocrystals are formed by a topotactic structural transformation mechanism in the HTO-Bi2O 3-Na2CO3 reaction system and by a combination mechanism of the topotactic structural transformation and epitaxial crystal growth in the HTO-TiO2-Bi2O3-Na 2CO3 reaction system, respectively. The BNT mesocrystals prepared by these methods are constructed from [100]-oriented BNT nanocrystals. Furthermore, these reaction systems were successfully applied to the fabrication of [100]-oriented BNT ferroelectric ceramic materials. A BNT ceramic material with a high degree of orientation, high relative density, and small grain size was achieved.
AB - Ferroelectric mesocrystals of Bi0.5Na0.5TiO 3 (BNT) with [100]-crystal-axis orientation were successfully prepared using a topotactic structural transformation process from a layered titanate H1.07Ti1.73O4·nH2O (HTO). The formation reactions of BNT mesocrystals in HTO-Bi2O 3-Na2CO3 and HTO-TiO2-Bi 2O3-Na2CO3 reaction systems and their nanostructures were studied by XRD, FE-SEM, TEM, SAED, and EDS, and the reaction mechanisms were given. The BNT mesocrystals are formed by a topotactic structural transformation mechanism in the HTO-Bi2O 3-Na2CO3 reaction system and by a combination mechanism of the topotactic structural transformation and epitaxial crystal growth in the HTO-TiO2-Bi2O3-Na 2CO3 reaction system, respectively. The BNT mesocrystals prepared by these methods are constructed from [100]-oriented BNT nanocrystals. Furthermore, these reaction systems were successfully applied to the fabrication of [100]-oriented BNT ferroelectric ceramic materials. A BNT ceramic material with a high degree of orientation, high relative density, and small grain size was achieved.
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U2 - 10.1021/ic4015256
DO - 10.1021/ic4015256
M3 - Article
C2 - 23978153
AN - SCOPUS:84884275101
SN - 0020-1669
VL - 52
SP - 10542
EP - 10551
JO - Inorganic chemistry
JF - Inorganic chemistry
IS - 18
ER -